EX-10.1





 Exhibit 10.1 

Exchange Agreement 

May 31, 2018 
 Quidel Corporation 

12544 High Bluff Drive, Suite 200 
 San Diego, California 92130

 Attn: Randall J. Steward 
  

	Re:	Exchange of 3.25% Convertible Senior Notes due 2020 for Common Stock 

 Ladies and Gentlemen: 

The undersigned investor (the “Investor”), for itself and on behalf of the beneficial owners listed on Exhibit B.1
hereto (“Accounts”) for whom the Investor confirms it holds contractual and investment authority (each, including the Investor if it is a party exchanging Notes (as defined below), an “Exchanging Investor”), hereby
agrees to exchange, with Quidel Corporation, a Delaware corporation (the “Company”), certain 3.25% Convertible Senior Notes due 2020, CUSIP 74838J AA9 (the “Notes”) for shares (the “Shares”) of the
Company’s Common Stock, par value $0.001 per share (the “Common Stock”). The Investor understands that the exchange (the “Exchange”) is being made without registration of the offer or sale of the Shares under
the Securities Act of 1933, as amended (the “Securities Act”), or any securities laws of any state of the United States or of any other jurisdiction and that the Shares are being offered only to institutional “accredited
investors” within the meaning of Rule 501 of Regulation D under the Securities Act that are also “qualified institutional buyers” within the meaning of Rule 144A under the Securities Act, pursuant to a private placement exemption from
registration under Section 4(a)(2) of the Securities Act. 
 This Exchange Agreement and the Terms and Conditions for Exchange of
Securities, dated May 31, 2018, attached hereto as Exhibit A (the “Terms and Conditions” and, together with this Exchange Agreement, this “Agreement”) is made as of the date hereof between the Company
and the Investor. 
 Subject to the terms and conditions of this Agreement, the Investor hereby agrees to exchange, and cause the other
Exchanging Investors to exchange, $[        ] aggregate principal amount of the Notes (the “Exchanged Notes”) for a number of Shares as set forth in the Terms and Conditions, and the Company
agrees to issue such Shares to the Exchanging Investors in exchange for such Exchanged Notes. 
 At or prior to the times set forth in
Exhibit B.2 hereto (the “Exchange Procedures”), the Investor shall cause the Exchanged Notes to be delivered by book entry transfer through the facilities of The Depository Trust Company (“DTC”) to The Bank
of New York Mellon Trust Company, N.A., in its capacity as trustees of the Notes (in such capacity, the “Trustee”), for the account/benefit of the Company for cancellation as instructed in the Exchange Procedures and at Closing (as
defined in the Terms and Conditions); and on the Closing Date (as defined in the Terms and Conditions), subject to satisfaction of the conditions precedent specified in Section 5 of the Terms and Conditions and the prior receipt by the Trustee
from the Investor of the Exchanged Notes, the Company shall deliver to the DTC account specified by the Investor for each relevant Exchanging Investor in Exhibit B.1 a number of Shares as set forth in the Terms and Conditions. All questions
as to the form of all documents and the validity and acceptance of the Exchanged Notes and the Shares will be determined by the Company, in its sole discretion, which determination shall be final and binding. 

Subject to the terms and conditions of this Agreement, the Investor hereby, for itself and on behalf of the Accounts, (a) waives any and
all other rights with respect to the Exchanged Notes and (b) releases and 












 
discharges the Company from any and all claims the undersigned and the Accounts may now have, or may have in the future, arising out of, or related to, the Exchanged Notes. 

Each of the provisions of the Terms and Conditions is incorporated herein by reference in its entirety, and shall be deemed to be a part of
this Exchange Agreement to the same extent as if such provisions had been set forth in full herein; and each of the representations, warranties, and agreements set forth therein shall be deemed to have been made at and as of the date of this
Exchange Agreement. Unless otherwise defined herein, terms defined in the Terms and Conditions are used herein as therein defined. 
 This
Agreement constitutes the entire agreement between the Company and the Investor with respect to the subject matters hereof. This Exchange Agreement may be executed by one or more of the parties hereto in any number of separate counterparts
(including by facsimile or other electronic means, including telecopy, email or otherwise), and all of said counterparts taken together shall be deemed to constitute one and the same instrument. Delivery of an executed signature page of this
Exchange Agreement by facsimile or other transmission (e.g., “pdf” or “tif” format) shall be effective as delivery of a manually executed counterpart hereof. 

[SIGNATURE PAGE FOLLOWS] 












 If the foregoing correctly sets forth your understanding as to the matters set forth herein,
please indicate your acceptance thereof in the space provided below for that purpose and deliver a copy to the undersigned, whereupon this Agreement shall constitute a binding agreement between the Company and the Investor. 

 

			
	 Very truly yours,

	 Quidel
Corporation



 
			
		
	 By
	 	  

	 Name:
	 	
	 Title:
	 	














 Please confirm that the foregoing correctly sets forth the agreement between the Company and
the Investor by signing in the space provided below for that purpose. 
  

			
	AGREED AND ACCEPTED:
	
	Investor:
	 [                    ],

in its capacity as described in the first paragraph hereof





			
		
	By	 	  

	Name:	 	
	Title:	 	


  












 EXHIBIT A 

Terms and Conditions for Exchange of Securities 

Each of Quidel Corporation, a Delaware corporation (the “Company”), and the undersigned (the
“Investor”), for itself and on behalf of the beneficial owners listed on Exhibit B.1 to the Exchange Agreement for whom the Investor holds contractual and investment authority (together with the Investor, the
“Exchanging Investors”), hereby confirms its agreement pursuant to that certain exchange agreement, dated as of May 31, 2018 (the “Exchange Agreement”), to which these Terms and Conditions for Exchange
of Securities (the “Terms and Conditions”) are attached as Exhibit A, as set forth in these Terms and Conditions and in the Exchange Agreement (together, this “Agreement”) relating to the exchange of certain
Notes for Shares as set forth in this Agreement. Capitalized terms used but not defined in the Terms and Conditions have the meanings set forth in the Exchange Agreement. 

1.    Exchange Consideration; Exchange. On the basis of the representations,
warranties and agreements herein contained and subject to the terms and conditions herein set forth, the Investor hereby agrees to exchange, and to cause the other Exchanging Investors to exchange, $18,663,000 aggregate principal amount of the Notes
(the “Exchanged Notes”) for: 
 (a)    a number of Shares per $1,000
principal amount of such Exchanged Notes equal to 28.3821; plus 
 (b)    an
additional number of Shares per $1,000 principal amount of such Exchanged Notes equal to $295.98 divided by the average of the Daily VWAPs (as defined below) over the Reference Period (as defined below) (the aggregate number of Shares
under clause (a) and (b), the “Exchange Consideration”); 
 in each case, as adjusted in good faith by
the Company for any stock dividend, stock split, stock combination, reclassification or similar transaction occurring on or after the date hereof and prior to the Closing Date; provided that the aggregate amount of Shares for all Exchanged
Notes shall be rounded down to the nearest whole share for each Exchanging Investor. 
 For the avoidance of doubt, no cash
will be paid to any Exchanging Investor in respect of any accrued and unpaid interest on the Exchanged Notes; provided that, if the Investor holds the Notes on June 1st (the Record Date as defined in the Indenture), the Investor will receive the
interest payment via the ordinary Depository Trust Company process. 
 “Business Day” means
any day other than a Saturday, a Sunday or a day on which state or federally chartered banking institutions in New York, New York are authorized or required to be closed. 

“Closing Sale Price” is defined in the Indenture, dated as of December 1, 2014, between
the Company and the Trustee, as supplemented by the First Supplemental Indenture, dated as of December 8, 2014, between the Company and the Trustee, in respect of the Notes (as supplemented, the “Indenture”). 

“Daily VWAP” means, for each Trading Day (as defined below) in the Reference Period (as
defined below), the per share volume-weighted average price of the Common Stock as displayed under the heading “Bloomberg VWAP” on Bloomberg page “QDEL <equity> AQR” (or its equivalent successor if such page is not
available) in respect of the period from the scheduled open of trading until the scheduled close of trading of the primary trading session on such Trading Day (or if such volume-weighted average price is unavailable, the Closing Sale


  
 Ex. A – 1 













 
Price on such day). The “Daily VWAP” will be determined without regard to pre- or after-hours trading or any other trading outside of the regular
trading session trading hours. 
 “Market Disruption Event” means (i) a failure
by The NASDAQ Global Select Market, or if the Common Stock is not listed on The NASDAQ Global Select Market, the principal other U.S. national or regional securities exchange on which the Common Stock is then listed, to open for trading or
(ii) the occurrence or existence for more than a one half-hour period in the aggregate on any Scheduled Trading Day (as defined in the Indenture) for the Common Stock of any suspension or limitation imposed on trading (by reason of movements in
price exceeding limits permitted by The NASDAQ Global Select Market or otherwise) in the Common Stock or in any options contracts or future contracts relating to the Common Stock, and such suspension or limitation occurs or exists at any time before
1:00 p.m. (New York City time) on such day. 
 “Reference Period” means the period of three
consecutive Trading Days commencing on the first Trading Day following the date hereof. 
 “Trading
Day” means a day on which (i) there is no Market Disruption Event and (ii) The NASDAQ Global Select Market or, if the Common Stock is not listed on The NASDAQ Global Select Market, the principal other U.S. national or regional
securities exchange on which the Common Stock is then listed is open for trading, in either case, with a scheduled closing time of 4:00 p.m. (New York City time) or the then-standard closing time for regular trading on the relevant exchange or
market. For the purposes of this definition, if the Common Stock is not so listed, “Trading Day” means a Business Day. 

The Exchange shall occur in accordance with the Exchange Procedures; provided that each of the Company and the Investor
acknowledges that the delivery of the Exchanged Notes for withdrawal through the Deposits and Withdrawal at Custodian (“DWAC”) program through the DTC or the delivery of the Shares to any Exchanging Investor may be delayed due to
procedures and mechanics within the system of the DTC or The NASDAQ Global Select Market (“NASDAQ”) (including the procedures and mechanics regarding the listing of the Shares on NASDAQ) and that such a delay will not be a default
under this Agreement so long as (i) the Investor and/or the Company, as the case may be, is using its reasonable best efforts to effect such delivery, and (ii) such delay is no longer than three Business Days; provided,
further, that no delivery of Shares will be made until such Exchanged Notes have been properly submitted for withdrawal through the DWAC program in accordance with this Agreement, and no accrued interest will be payable by reason of any delay
in making such delivery. 
 The cancellation of the Exchanged Notes shall be effected through the DWAC program in accordance
with the customary procedures of the Trustee. 
 For the avoidance of doubt, as of the Closing, the aggregate principal
amount of Exchanged Notes shall be terminated and cancelled in full and the Exchanging Investors shall have no rights thereunder, except the right to receive the Shares on the Closing Date. 

2.    The Closing. The closing of the Exchange (the “Closing”) shall take place at the offices of
Gibson, Dunn & Crutcher LLP at 10:00 a.m., New York City time, on the eighth Trading Day following the last day of the Reference Period (the “Closing Date”), or at such other time and place as the Company and the Investor
may mutually agree. 
 3.    Representations and Warranties and Covenants of the Company. As of the date hereof
and as of the Closing, the Company represents and warrants to, and covenants with, the Exchanging Investors that: 

  
 Ex. A – 2 













 (a)    The Company has been duly
organized and is validly existing as a corporation in good standing under the laws of the State of Delaware and has the corporate power and authority to own, lease and operate its properties and to conduct its business as it is currently being
conducted. 
 (b)    The Company has full power and authority to enter into this
Agreement and perform all obligations required to be performed by the Company hereunder. 

(c)    This Agreement has been duly authorized, executed and delivered by the Company and
constitutes a legal, valid and binding obligation of the Company, enforceable against the Company in accordance with its terms, except that such enforcement may be limited by bankruptcy, insolvency (including, without limitation, all laws relating
to fraudulent transfers), reorganization, moratorium or similar laws affecting enforcement of creditors’ rights generally and except as enforcement thereof is subject to general principles of equity (regardless of whether enforcement is
considered in a proceeding in equity or at law). 
 (d)    The execution of this
Agreement by the Company and the consummation by the Company of the transactions contemplated hereby (i) does not require the consent, approval, authorization, order, registration or qualification of, or filing with, any governmental authority,
non-governmental regulatory authorities (including NASDAQ, other than the filing with NASDAQ of a Listing of Additional Shares notification (the “LAS”) which the Company will so file prior to
the issuance of Shares included in the Exchange Consideration on the Closing Date), or court, or body or arbitrator having jurisdiction over the Company (except as may be required under the securities or Blue Sky laws of the various states); (ii)
does not and will not constitute or result in a breach, violation or default under any note, bond, mortgage, deed, indenture, lien, instrument, contract, agreement, lease or license, whether written or oral, express or implied, or any statute, law,
ordinance, decree, order, injunction, rule, directive, judgment or regulation of any court, administrative or regulatory body, governmental authority, arbitrator, mediator or similar body on the part of the Company or cause the acceleration or
termination of any obligation or right of the Company, and (iii) does not and will not constitute or result in a breach, violation or default under the Company’s Certificate of Incorporation or
by-laws, except in the case of clause (ii), where such violations, conflicts, breaches or defaults would not, individually or in the aggregate, reasonably be expected to have a have a material adverse effect
on the business, properties, financial position, stockholders’ equity, or results of operations of the Company and its subsidiaries taken as a whole (a “Material Adverse Effect”) or prevent or materially interfere with
consummation of the transactions contemplated by this Agreement. 
 (e)    The Shares
have been duly reserved for issuance and, when issued, delivered and paid for in the manner set forth in this Agreement, will be validly issued, fully paid and non-assessable, and the issuance of such Shares
will not be subject to any preemptive or similar rights, other than any rights that have been complied with or waived. 

(f)    Assuming the accuracy of the representations and warranties of the Investor set
forth in this Agreement, the issuance of the Shares pursuant to this Agreement are exempt from the registration requirements of the Securities Act and the Shares will not be subject to restrictions on transfer under the Securities Act (and will not
have any restrictive legends on such certificates or book-entry notations representing such Shares). 

(g)    The Company hereby agrees to publicly disclose on or before 8:30 a.m., New York City
time, on the first Business Day after the date hereof, the exchange of the Exchanged Notes as contemplated by this Agreement in a press release; provided that if the Exchange does 

  
 Ex. A – 3 













 
not take place no press release will be required. The Company hereby acknowledges and agrees that any press release will disclose all confidential information to the extent the Company believes
such confidential information constitutes material non-public information, if any, with respect to the Exchange or otherwise communicated by the Company to the Investor or any Exchanging Investor in connection
with the Exchange. 
 (h)    The Company is responsible for paying all of its fees and
expenses, the fees and expenses of its advisors, transfer agent, registrar and other representatives, if any, of the transactions contemplated by this Agreement; provided that Investor (for itself and on behalf of the Exchanging Investors) is
responsible for any applicable transfer taxes. 
 (i)    The Company will, upon request,
execute and deliver any additional documents deemed by the Trustee or the transfer agent to be reasonably necessary to complete the transactions contemplated by this Agreement. 

(j)    The Company and each of its subsidiaries within the meaning of Rule 1-02(w) of Regulation S-X promulgated under the Securities Act (“subsidiaries”) have been duly organized and are validly existing and in good standing under
the laws of their respective jurisdictions of organization, are duly qualified to do business and are in good standing in each jurisdiction in which their respective ownership or lease of property or the conduct of their respective businesses
requires such qualification, and have all power and authority necessary to own or hold their respective properties and to conduct the businesses in which they are engaged, except where the failure to be so qualified or have such power or authority
would not, individually or in the aggregate, (i) have a Material Adverse Effect, (ii) prevent or materially interfere with consummation of the transactions contemplated by this Agreement, or (iii) result in the delisting of Shares
from NASDAQ. 
 4.    Representations and Warranties and Covenants of the Investor. As of the date hereof and as
of the Closing, the Investor hereby, for itself and on behalf of the Exchanging Investors, represents and warrants to, and covenants with, the Company that: 

(a)    The Investor and each Exchanging Investor is a corporation, limited partnership,
limited liability company or other entity, as the case may be, duly formed, validly existing and in good standing under the laws of the jurisdiction of its formation. 

(b)    The Investor has all requisite corporate (or other applicable entity) power and
authority to execute and deliver this Agreement for itself and on behalf of the Exchanging Investors and to carry out and perform its obligations under the terms hereof and the transactions contemplated hereby. This Agreement has been duly
authorized, executed and delivered by the Investor and constitutes the valid and binding obligation of the Investor, enforceable in accordance with its terms, subject to laws of general application relating to bankruptcy, insolvency and the relief
of debtors, and rules of law governing specific performance, injunctive relief or other equitable remedies. If the Investor is executing this Agreement on behalf of an Account, (i) the Investor has all requisite discretionary and contractual
authority to enter into this Agreement on behalf of, and, bind, each Account, and (ii) Exhibit B.1 attached to the Exchange Agreement is a true, correct and complete list of (A) the name of each Account and (B) the principal
amount of each Account’s Exchanged Notes. 
 (c)    Each of the Exchanging Investors
is the current sole legal and beneficial owner of the Exchanged Notes set forth on Exhibit B.1 attached to the Exchange Agreement. When the Exchanged Notes are exchanged, the Company will acquire good, marketable and unencumbered


  
 Ex. A – 4 













 
title thereto, free and clear of all liens, restrictions, charges, encumbrances or adverse claims, rights or proxies of any kind (i) arising by operation of applicable law, (ii) arising
by operation of any organizational documents of the Company, the Investor, each Exchanging Investor or the Notes, (iii) that is not terminated on or prior to the Closing, or (iv) created by or imposed by or on the Company. None of the
Exchanging Investors has, in whole or in part, other than pledges or security interests that an Exchanging Investor may have created in favor of a prime broker under and in accordance with its prime brokerage agreement with such broker,
(x) assigned, transferred, hypothecated, pledged, exchanged or otherwise disposed of any of its Notes (other than to the Company pursuant hereto), or (y) given any person or entity any transfer order, power of attorney or other authority
of any nature whatsoever with respect to its Notes. 
 (d)    The execution, delivery and
performance of this Agreement by the Investor and compliance by the Investor with all provisions hereof and the consummation of the transactions contemplated hereby, will not (i) require any consent, approval, authorization or other order of,
or qualification with, any court or governmental body or agency (except as may be required under the securities or Blue Sky laws of the various states), (ii) constitute a breach or violation of any of the terms or provisions of, or result in a
default under, (x) the organizational documents of any of the Investor or any Exchanging Investor or (y) any material indenture, loan agreement, mortgage, lease or other agreement or instrument to which the Investor or any of the
Exchanging Investors is a party or by which such Investor or any such Exchanging Investor is bound, or (iii) violate or conflict with any applicable law or any rule, regulation, judgment, decision, order or decree of any court or any
governmental body or agency having jurisdiction over the Investor or any of the Exchanging Investors. 

(e)    The Investor and each Exchanging Investor is a resident of the jurisdiction set
forth on Exhibit B.1 attached to the Exchange Agreement. 
 (f)    The Investor
and each Exchanging Investor will comply with all applicable laws and regulations in effect necessary for the Investor to consummate the transactions contemplated hereby and obtain any consent, approval or permission required for the transactions
contemplated hereby and the laws and regulations of any jurisdiction to which the Investor and each such Exchanging Investor is subject, and the Company shall have no responsibility for the Investor’s or any Exchanging Investors failure to do
any of the above. 
 (g)    The Investor acknowledges that no person has been authorized
to give any information or to make any representation or warranty concerning the Company or the Exchange other than the information set forth herein in connection with the Investor’s and the Exchanging Investor’s examination of the Company
and the terms of the Exchange and the Shares, and the Company does not, and the J. Wood Capital Advisors LLC (the “Placement Agent”) does not, take any responsibility for, and neither the Company nor the Placement Agent can provide
any assurance as to the reliability of, any other information, if any, that others may provide to the Investor or any Exchanging Investor. 

(h)    The Investor and each Exchanging Investor has such knowledge, skill and experience
in business, financial and investment matters so that it is capable of evaluating the merits and risks with respect to the Exchange and an investment in the Shares. With the assistance of each Exchanging Investor’s own professional advisors, to
the extent that the Exchanging Investor has deemed appropriate, such Exchanging Investor has made its own legal, tax, accounting and financial evaluation of the merits and risks of an investment in the Shares and the consequences of the Exchange and
this Agreement and the Exchanging Investor has made its own independent decision that the investment in the Shares is suitable and appropriate for the 

  
 Ex. A – 5 













 
Exchanging Investor. Each Exchanging Investor has considered the suitability of the Shares as an investment in light of such Exchanging Investor’s circumstances and financial condition and
is able to bear the risks associated with an investment in the Shares. 
 (i)    The
Investor confirms that it and each Exchanging Investor is not relying on any communication (written or oral) of the Company, the Placement Agent or any of their respective affiliates or representatives as investment advice or as a recommendation to
purchase the Shares in the Exchange. It is understood that information provided by the Company, the Placement Agent or any of their respective affiliates and representatives shall not be considered investment advice or a recommendation to enter into
the Exchange, and that none of the Company, the Placement Agent or any of their respective affiliates or representatives is acting or has acted as an advisor to the Investor or any Exchanging Investor in deciding whether or not to invest in the
Shares. 
 (j)    The Investor confirms that the Company has not (i) given any
guarantee, representation or warranty as to the potential success, return, effect or benefit (either legal, regulatory, tax, financial, accounting or otherwise) of an investment in the Shares or (ii) made any representation or warranty to the
Investor or any Exchanging Investor regarding the legality of an investment in the Shares under applicable legal investment or similar laws or regulations. In deciding to participate in the Exchange, the Investor is not relying on the advice or
recommendations of the Company and the Investor has made its own independent decision that the investment in the Shares is suitable and appropriate for the Investor and the Exchanging Investors. 

(k)    The Investor and each Exchanging Investor is familiar with the business and
financial condition and operations of the Company and the Investor and each Exchanging Investor has had the opportunity to conduct its own investigation of the Company and the Shares. The Investor and each Exchanging Investor has had access to
Company’s filings made with the Securities and Exchange Commission (the “SEC”) and such other information concerning the Company and the Shares as it deems necessary to enable it to make an informed investment decision
concerning the Exchange. The Investor and each Exchanging Investor has been offered the opportunity to ask such questions of the Company and its representatives and received answers thereto, as it deems necessary to enable it to make an informed
investment decision concerning the Exchange. 
 (l)    The Investor acknowledges and
understands that at the time of the Closing, the Company may be in possession of material non-public information not known to the Investor or any Exchanging Investor that may impact the value of the Notes,
including the Exchanged Notes, and the Shares (“Information”) that the Company has not disclosed to the Investor or any Exchanging Investor. The Investor and each Exchanging Investor understands, based on its experience, the
disadvantage to which the Investor and each Exchanging Investor is subject due to the disparity of information between the Company, on the one hand, and the Investor and each Exchanging Investor, on the other hand. Notwithstanding this, the Investor
and each Exchanging Investor has deemed it appropriate to participate in the Exchange. The Investor agrees that the Company and its directors, officers, employees, agents, stockholders and affiliates shall have no liability to the Investor or any
Exchanging Investor or their respective beneficiaries whatsoever due to or in connection with the Company’s use or non-disclosure of the Information or otherwise as a result of the Exchange, and the
Investor hereby irrevocably waives any claim that it or any Exchanging Investor might have based on the failure of the Company to disclose the Information. 

(m)    The Investor and each Exchanging Investor understands that no federal, state, local
or foreign agency has passed upon the merits or risks of an investment in the Shares or made any finding or determination concerning the fairness or advisability of this investment. 

  
 Ex. A – 6 













 (n)    Each Exchanging Investor is an
“accredited investor” as defined in Rule 501(a) under the Securities Act and it and any account (including for purposes of this Section 4(n), the Accounts) for which it is acting (for which it has sole
investment discretion) is a “qualified institutional buyer” as defined in Rule 144A under the Securities Act. The Investor agrees to furnish any additional information reasonably requested by the Company or any of its representatives to
assure compliance with applicable U.S. federal and state securities laws in connection with the Exchange. 

(o)    The Investor and each Exchanging Investor is not, and has not been during the
consecutive three month period preceding the date hereof and as of the Closing, will not be, a director, officer or “affiliate” within the meaning of Rule 144 promulgated under the Securities Act (an “Affiliate”) of the
Company. To the Investor’s knowledge, no Exchanging Investor acquired any of the Notes, directly or indirectly, from an Affiliate of the Company. Each Exchanging Investor and its Affiliates collectively beneficially own and will beneficially
own as of the Closing Date (i) less than 10% of the outstanding Common Stock and (ii) less than 10% of the aggregate number of votes that may be cast by holders of those outstanding securities of the Company that entitle the holders
thereof to vote generally on all matters submitted to the Company’s stockholders for a vote (the “Voting Power”). No Exchanging Investor is a subsidiary, affiliate or, to the Investor’s knowledge, otherwise closely-related to any director or officer of the Company or beneficial owner of 10% or more of the outstanding Common Stock or Voting Power (each such director, officer or beneficial owner, a “Related
Party”). To the Investor’s knowledge, no Related Party beneficially owns 10% or more of the outstanding voting equity, or votes entitled to be cast by the outstanding voting equity, of any Exchanging Investor. 

(p)    Neither the Investor nor any Exchanging Investor is directly, or indirectly through
one or more intermediaries, controlling or controlled by, or under direct or indirect common control with, the Company. 

(q)    Each Exchanging Investor is acquiring the Shares solely for its own beneficial
account (or for any account (including for purposes of this Section 4(q), the Accounts) for which it has sole investment discretion), for investment purposes, and not with a view to, or for resale in connection with,
any distribution of the Shares. The Investor and each Exchanging Investor understands that the offer and sale of the Shares have not been registered under the Securities Act or any state securities laws and the Shares are being offered and sold
without registration under the Securities Act by reason of specific exemption(s) under the provisions thereof which depend in part upon the investment intent of the Exchanging Investors and the accuracy of the other representations and warranties
made by the Investor in this Agreement. The Investor and the Exchanging Investors understand that the Company is relying upon the representations, warranties and agreements contained in this Agreement (and any supplemental information provided to
the Company by the Investor or the Exchanging Investors) for the purpose of determining whether this transaction meets the requirements for such exemption(s). 

(r)    The Investor acknowledges that the terms of the Exchange have been mutually
negotiated between the Investor and the Company. The Investor was given a meaningful opportunity to negotiate the terms of the Exchange. 

(s)    The Investor acknowledges that it and each Exchanging Investor had a sufficient
amount of time to consider whether to participate in the Exchange and that neither the Company nor the Placement Agent has placed any pressure on the Investor or any Exchanging Investor to respond to the opportunity to participate in the Exchange.
The Investor acknowledges that neither it nor any Exchanging Investor became aware of the Exchange through any form of general 

  
 Ex. A – 7 













 
solicitation or advertising within the meaning of Rule 502 under the Securities Act or otherwise through a “public offering” under Section 4(a)(2) of the Securities Act. 

(t)    The operations of the Investor and each Exchanging Investor have been conducted in
material compliance with the applicable rules and regulations administered or conducted by the U.S. Department of Treasury Office of Foreign Assets Control (“OFAC”), the applicable rules and regulations of the Foreign Corrupt
Practices Act (“FCPA”) and the applicable Anti-Money Laundering (“AML”) rules in the Bank Secrecy Act. The Investor has performed due diligence necessary to reasonably determine that the Exchanging Investors are not
named on the lists of denied parties or blocked persons administered by OFAC, resident in or organized under the laws of a country that is the subject of comprehensive economic sanctions and embargoes administered or conducted by OFAC
(“Sanctions”), are not otherwise the subject of Sanctions and have not been found to be in violation or under suspicion of violating OFAC, FCPA or AML rules and regulations. 

(u)    The Investor acknowledges it and each Exchanging Investor understands that the
Company intends to pay a financial advisor a fee in respect of the Exchange. 

(v)    The Investor will, upon request, execute and deliver, for itself and on behalf of
any Exchanging Investor, any additional documents deemed by the Company and the Trustee or the transfer agent to be reasonably necessary to complete the transactions contemplated by this Agreement. 

(w)    The Investor understands that, unless the Investor notifies the Company in writing
to the contrary before the Closing, each of the Investor’s representations and warranties contained in this Agreement will be deemed to have been reaffirmed and confirmed as of the Closing. 

(x)    No later than one (1) Business Day after the date hereof, the Investor agrees
to deliver to the Company settlement instructions substantially in the form of Exhibit B.1 attached to the Exchange Agreement for each of the Exchanging Investors. 

(y)    The Investor acknowledges and agrees that it and each Exchanging Investor has not
disclosed, either directly or indirectly, and will not disclose, to any third party any information regarding the Exchange, and has not transacted, and will not transact, either directly or indirectly, in any securities of the Company, including,
but not limited to, any hedging transactions, short sales or other derivatives transactions, from the time the Investor was first contacted by the Company or the Placement Agent with respect to the transactions contemplated by this Agreement until
after the confidential information (as described in the confirmatory wall-crossing email received by the Investor from the Placement Agent) is made public. 

(z)    The Investor acknowledges that the Company may issue appropriate stop-transfer
instructions to its transfer agent, if any, and may make appropriate notations to the same effect in its books and records to ensure compliance with the provisions of this Section 4. 

(aa)    The Investor understands that the Company, the Placement Agent and others will rely
upon the truth and accuracy of the foregoing representations, warranties and covenants and agrees that if any of the representations and warranties deemed to have been made by it or the Exchanging Investors by participation in the transactions
contemplated by this Agreement and acquisition of the Shares are no longer accurate, the Investor shall promptly notify the Company and the Placement Agent. The Investor understands that, unless the Investor notifies the Company


  
 Ex. A – 8 













 
in writing to the contrary before the Closing, each of the Investor’s representations and warranties contained in this Agreement, including those made on behalf of the Exchanging Investors,
will be deemed to have been reaffirmed and confirmed as of the Closing. If the Investor is exchanging any Exchanged Notes and acquiring the Shares as a fiduciary or agent for one or more accounts (including for purposes of this
Section 4(aa), the Accounts which are Exchanging Investors), it represents that (i) it has sole investment discretion with respect to each such account, (ii) it has full power to make the foregoing
representations, warranties and covenants on behalf of such account and (iii) it has contractual authority with respect to each such account. 

(bb)    The Investor acknowledges and agrees that the Placement Agent has not acted as a
financial advisor or fiduciary to the Investor or any Exchanging Investor and that the Placement Agent and its respective directors, officers, employees, representatives and controlling persons have no responsibility for making, and have not made,
any independent investigation of the information contained herein or in the Company’s SEC filings and make no representation or warranty to the Investor or any Exchanging Investor, express or implied, with respect to the Company, the Notes or
the Shares or the accuracy, completeness or adequacy of the information provided to the Investor or any Exchanging Investor or any other publicly available information, nor shall any of the foregoing persons be liable for any loss or damages of any
kind resulting from the use of the information contained therein or otherwise supplied to the Investor or any Exchanging Investor. 

5.    Conditions to Obligations of the Investor and the Company. The obligations of the Investor to deliver (or
cause to be delivered) the Exchanged Notes and of the Company to deliver the Shares to each Exchanging Investor in accordance with this Agreement are subject to the satisfaction at or prior to the Closing of the following conditions precedent:
(a) the representations and warranties of the Company contained in Section 3 hereof and of the Investor contained in Section 4 hereof shall be true and correct as of the Closing in all
respects with the same effect as though such representations and warranties had been made as of the Closing, and (b) no provision of any applicable law or any judgment, ruling, order, writ, injunction, award or decree of any governmental
authority shall be in effect prohibiting or making illegal the consummation of the transactions contemplated by this Agreement. 

The obligations of the Investor to deliver (or cause to be delivered) the Exchanged Notes is subject to the following
conditions: the Shares (i) shall have been approved for listing on the NASDAQ and (ii) shall not have been suspended, as of the Closing Date, by the SEC or the NASDAQ from trading on the NASDAQ. 

The obligations of the Company to deliver the Shares is subject to the Investor properly submitting (or causing to be
submitted) the Exchanged Notes for withdrawal through the DWAC program in accordance with the Exchange Procedures. 

6.    Waiver, Amendment. Neither these Terms and Conditions, the Exchange Agreement nor any provisions hereof or
thereof shall be modified, changed or discharged, except by an instrument in writing, signed by the Company and the Investor. 

7.    Assignability. Neither this Agreement nor any right, remedy, obligation or liability arising hereunder or by
reason hereof shall be assignable by either the Company or the Investor without the prior written consent of the other. 

8.    Taxation. The Investor acknowledges that, if an Exchanging Investor is a United States person for U.S.
federal income tax purposes, either (i) the Company must be provided with a correct taxpayer identification number (“TIN”) (generally a person’s social security or federal employer identification


  
 Ex. A – 9 













 
number) and certain other information on a properly completed and executed Internal Revenue Service (“IRS”) Form W-9, or (ii) another
basis for exemption from backup withholding must be established. The Investor further acknowledges that, if an Exchanging Investor is not a United States person for U.S. federal income tax purposes, the Company must be provided the appropriate
properly completed and executed IRS Form W-8, attesting to that non-U.S. Exchanging Investor’s foreign status and certain other information, including information
establishing an exemption from withholding under Sections 1471 through 1474 of the Internal Revenue Code of 1986, as amended. The Investor further acknowledges that any Exchanging Investor may be subject to 30% U.S. federal withholding or 28% U.S.
federal backup withholding on certain payments made to such Exchanging Investor unless such Exchanging Investor properly establishes an exemption from, or a reduced rate of, such withholding or backup withholding. See Exhibit C for
additional details. 
 9.    Waiver of Jury Trial. EACH OF THE COMPANY AND THE INVESTOR, ON ITS OWN BEHALF AND ON
BEHALF OF THE EXCHANGING INVESTORS, HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY WITH RESPECT TO ANY LEGAL PROCEEDING ARISING OUT OF THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. 

10.    Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of
New York, without giving effect to such state’s rules concerning conflicts of laws that might provide for any other choice of law. 

11.    Submission to Jurisdiction. Each of the Company and the Investor, on its own behalf and on behalf of the
Exchanging Investors, (a) agrees that any legal suit, action or proceeding arising out of or relating to this Agreement or the transactions contemplated hereby shall be instituted exclusively in the courts of the State of New York located in
the City and County of New York or in the United States District Court for the Southern District of New York; (b) waives any objection that it may now or hereafter have to the venue of any such suit, action or proceeding; and
(c) irrevocably consents to the jurisdiction of the aforesaid courts in any such suit, action or proceeding. Each of the Company and the Investor agrees that a final judgment in any such action or proceeding shall be conclusive and may be
enforced in other jurisdictions by suit on the judgment or in any other manner provided by law 
 12.    Venue.
Each of the Company and the Investor irrevocably and unconditionally waives, to the fullest extent it may legally and effectively do so, any objection which it may now or hereafter have to the laying of venue of any suit, action or proceeding
arising out of or relating to this Agreement in any court referred to in Section 11. Each of the Company and the Investor irrevocably waives, to the fullest extent permitted by law, the defense of an inconvenient forum to
the maintenance of such action or proceeding in any such court. 
 13.    Service of Process. The Investor
irrevocably consents to service of process in the manner provided for notices in Section 14. Nothing in this Agreement will affect the right of the Company or the Investor to serve process in any other manner permitted by
law. 
 14.    Agent for Service of Process. The Investor hereby irrevocably appoints and designates the Agent
for Service of Process as designated in Exhibit B.1 attached to the Exchange Agreement (the “Agent for Service of Process”) as its true and lawful
attorney-in-fact and duly authorized agent for the limited purpose of accepting service of legal process and the Investor agrees that service of process upon such party
shall constitute personal service of such process on such person. The Investor shall maintain the designation and appointment of the Agent for Service of Process at such address until all obligations under this Agreement shall have been completed in
total. If the Agent for Service of Process shall cease to so act, the Investor shall promptly deliver to the Company and the Placement Agent evidence in writing 

  
 Ex. A – 10 













 
of acceptance by another agent for service of process of such appointment, which such other agent for service of process shall have an address for receipt of service of process in the State of
New York and the provisions above shall equally apply to such other agent for service of process. 
 15.    Section
and Other Headings. The section and other headings contained in these Terms and Conditions are for reference purposes only and shall not affect the meaning or interpretation of this Agreement. 

16.    Notices. All notices and other communications to the Company provided for herein shall be in writing and
shall be deemed to have been duly given if delivered personally, sent by registered or certified mail, return receipt requested, postage prepaid or sent by facsimile or other form of electronic transmission and will be deemed given on the date
so delivered (or, if such day is not a Business Day, on the first subsequent Business Day) to the following addresses, or in the case of the Investor, the address provided on Exhibit B.1 attached to the Exchange Agreement (or such other
address as the Company or the Investor shall have specified by notice in writing to the other): 
  

					
	If to the Company:	  	 Quidel Corporation
 12544 High Bluff Drive,
Suite 200
 San Diego, California 92130
 Attn: Randall J.
Steward,
 Chief Financial Officer
 Facsimile: (858) 646-8028
 Email: rsteward@quidel.com
	  	
			
	with a copy to (which shall not constitute notice):	  	 Gibson, Dunn & Crutcher LLP
 3161
Michelson Drive
 Irvine, California 92612
 Attn: Michelle A.
Hodges
 Facsimile: (949) 475-4703

Email: mhodges@gibsondunn.com
	  	

 17.    Binding Effect. The provisions of this Agreement shall be binding upon and
accrue to the benefit of the Company and the Investor and their respective heirs, legal representatives, successors and assigns. 

18.    Notification of Changes. After the date of this Agreement, each of the Company and the Investor hereby
covenants and agrees to notify the other upon the occurrence of any event prior to the Closing of the Exchange pursuant to this Agreement that would cause any representation, warranty or covenant of the Company or the Investor, as the case may be,
contained in this Agreement to be false or incorrect. 
 19.    Reliance by Placement Agent and Financial
Advisor. The Placement Agent, acting as financial advisor to the Company, may rely on each representation and warranty of the Company and the Investor made herein or pursuant to the terms hereof with the same force and effect as if such
representation or warranty were made directly to the Placement Agent. The Placement Agent shall be a third-party beneficiary of this Agreement to the extent provided in this Section 19. 

20.    Severability. If any term or provision of this Agreement (in whole or in part) is invalid, illegal or
unenforceable in any jurisdiction, such invalidity, illegality or unenforceability shall not affect any other term or provision of this Agreement or invalidate or render unenforceable such term or provision in any other jurisdiction. 

  
 Ex. A – 11 













 21.    Survival. The representations and warranties of the
Company and the Investor contained in this Agreement or made by or on behalf of the Exchanging Investors pursuant to this Agreement shall survive the consummation of the transactions contemplated hereby. 

22.    Termination. This Agreement may be terminated and the transactions contemplated hereby abandoned (a) by
mutual agreement of the Company and the Investor or (b) by either the Company or the Investor if the conditions to such party’s obligations set forth herein have not been satisfied (unless waived by the party entitled to the benefit
thereof), and the Closing has not occurred on or before June 15, 2018 without liability of either the Company or the Investor or the Exchanging Investors, as the case may be; provided that neither the Company nor the Investor shall be
released from liability hereunder if the Agreement is terminated and the transactions abandoned by reason of the failure of the Company or the Investor or the Exchanging Investors, as the case may be to have performed its obligations hereunder.
Except as provided above, if this Agreement is terminated and the transactions contemplated hereby are not concluded as described above, the Agreement will become void and of no further force and effect. 

[The remainder of this page is intentionally left blank.] 

  
 Ex. A – 12 













 EXHIBIT B.1 

Exchanging Investor Information 
  

							
	 Exchanging Investor
	 	 Aggregate Principal Amount of
Exchanged Notes
	 	 DTC Participant Name
	 	 DTC Participant

Number

		 		 		 	
		 		 		 	
		 		 		 	

  

	
	Agent for Service of Process:
	  

	  

	  

	
	Investor Address:
	  

	  

	  

	
	Telephone:                                    
                                    
	
	 Country of Residence:

 

	
	 Taxpayer Identification Number:

 


 Account for Notes 
  

	
	DTC Participant Number:                                
                                         

	DTC Participant Name:                                 
                                         
  
	DTC Participant Phone Number:                               
                              
	DTC Participant Contact Email:                              
                                
	FFC Account #:                                  
                                         
             
	Account # at Bank/Broker:                               
                                       

 Account for Shares (if different from Notes) 

  
 Ex. B.1 – 1 














	
	DTC Participant Number:                                
                                         

	DTC Participant Name:                                 
                                         
  
	DTC Participant Phone Number:                               
                              
	DTC Participant Contact Email:                              
                                
	FFC Account #:                                  
                                         
             
	Account # at Bank/Broker:                               
                                       

  

	
	Exchanging Investor Address:
	  

	  

	  

	
	Telephone:                                    
                                    
	
	 Country of Residence:

 

	
	 Taxpayer Identification Number:

 



  
 Ex. B.1 – 2 













 EXHIBIT B.2 

Exchange Procedures 
 NOTICE
TO INVESTOR 
 Attached are Investor Exchange Procedures for the settlement of the exchange of 3.25% Convertible
Senior Notes due 2020, CUSIP 74838J AA9 (the “Notes”) of Quidel Corporation (the “Company”) for shares of the Company’s common stock, par value $0.001 per share (the “Shares”) pursuant to the
Exchange Agreement, dated as of May 31, 2018, between you and the Company (the “Exchange Agreement”) which is expected to occur on or about June 15, 2018. To ensure timely settlement, please follow the instructions for
exchanging your Notes for Shares as set forth on the following page. Capitalized terms used but not defined herein have the meanings set forth in the Exchange Agreement. 

These instructions supersede any prior instructions you received. Your failure to comply with the attached instructions may
delay your receipt of Shares for your Notes. 
 If you have any questions, please contact Alton Lo of J. Wood Capital
Advisors LLC at (415) 728-2222 or alton@jwoodcapital.com. 
 Thank you. 

  
 Ex. B.2 – 1 













 Delivery of Notes 

You must direct the eligible DTC participant through which you hold a beneficial interest in the Notes to post on
June 15, 2018, no later than 9:00 a.m., New York City time, one-sided withdrawal instructions through DTC via DWAC for the aggregate principal amount of Notes (CUSIP/ISIN # 74838J AA9 /
US74838JAA97) set forth in Exhibit B.1 of the Exchange Agreement to be exchanged for Shares. It is important that this instruction be submitted and the DWAC posted on June 15, 2018. 

The DTC Participant number of The Bank of New York Mellon Trust Company, N.A., the Trustee, is: 901. 

To receive Shares 
 You
must direct your eligible DTC participant through which you wish to hold a beneficial interest in the Shares to be issued upon exchange to post on June 15, 2018, no later than 9:00 a.m., New York City time, a one-sided deposit instruction through DTC via DWAC for a number of Shares (CUSIP/ISIN # 74838J101 / US74838J1016) equal to the aggregate Exchange Consideration per $1,000 principal amount of the Exchanged Notes set
forth in Exhibit B.1 of the Exchange Agreement. It is important that this instruction be submitted and the DWAC posted on June 15, 2018. 

American Stock Transfer & Trust Company is the Transfer Agent and Registrar for the Common Stock. 

Closing 
 On June 15,
2018, after the Company receives your Notes and your delivery instructions as set forth above, and subject to the satisfaction of the conditions to Closing as set forth in your Exchange Agreement, the Company will deliver your Shares in respect of
your Notes exchanged in accordance with the delivery instructions above. 

  
 Ex. B.2 – 2 













 EXHIBIT C 

Under U.S. federal income tax law, a holder who exchanges Notes for Shares generally must provide such holder’s correct
TIN on IRS Form W-9 below or otherwise establish a basis for exemption from backup withholding. A TIN is generally an individual holder’s social security number or a holder’s employer identification
number. If the correct TIN is not provided, the holder may be subject to a $50 penalty imposed by the IRS under Section 6723 of the Internal Revenue Code of 1986, as amended. In addition, certain payments made to holders may be subject to U.S.
backup withholding (currently set at 28% of the payment). If a holder is required to provide a TIN but does not have a TIN, the holder should consult its tax advisor regarding how to obtain a TIN. Certain holders are not subject to these backup
withholding and reporting requirements. A Non-U.S. holder must establish its status as an exempt recipient from backup withholding and can do so by submitting a properly completed IRS Form W-8 (available from the Company), signed, under penalties of perjury, attesting to such holder’s exempt foreign status. U.S. backup withholding is not an additional tax. Rather, the U.S. federal income tax
liability of persons subject to backup withholding will be reduced by the amount of tax withheld. If withholding results in an overpayment of taxes, a refund may be obtained provided that the required information is timely furnished to the IRS.
Holders are urged to consult their tax advisors regarding how to complete the appropriate forms and to determine whether they are exempt from backup withholding or other withholding taxes. 

  
 Ex. C – 1