**UNITED STATES   SECURITIES AND EXCHANGE COMMISSION  Washington, D.C. 20549**

**SCHEDULE 13D  Under the Securities Exchange Act of 1934   (Amendment No. )***

ViroLogic, Inc. (Name of Issuer) 

Common Stock, $.001 par value (Title of Class of Securities) 

92823R201 (CUSIP Number) 

Margaret M. Foran   Vice President - Corporate Governance and Secretary   Pfizer, Inc. 235 East 42nd Street   New York, New York 10017   ( 212)-733-4802 (Name, Address and Telephone Number of Person Authorized to Receive  Notices and Communications) 

November 18, 2002 (Date of Event which Requires Filing of this Statement) 

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If the filing person has previously filed a statement on Schedule 13G to      report the acquisition that is the subject of this Schedule 13D, and is      filing this schedule because of 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g),      check the following box. __

The remainder of this cover page shall be filled out for a reporting person's      initial filing on this form with respect to the subject class of securities,      and for any subsequent amendment containing information which would alter      disclosures provided in a prior cover page. 

The information required on the remainder of this cover page shall not      be deemed to be "filed" for the purpose of Section 18 of the Securities      Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of      that section of the Act but shall be subject to all other provisions of      the Act (however, see the Notes). 

 

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CUSIP No. 92823R201................................. 

1. Names of Reporting Persons.     I.R.S. Identification Nos. Of above persons (entities only). 

Pfizer Inc. 13-5315170 

2. Check the Appropriate Box if a Member of a Group (See Instructions) 

(a) 

(b) 

3. SEC Use Only ........................................................................................  

4. Source of Funds (See Instructions) ......WC..................................................  

5. Check if Disclosure of Legal Proceedings Is Required Pursuant to Items    2(d) or 2(e) 

6. Citizenship or Place of Organization Republic of Ireland 

Number of Shares Beneficially Owned by Each Reporting Person With:

7. Sole Voting Power.. 2,608,695............. 

8. Shared Voting Power 

9. Sole Dispositive Power 2,608,695 

10. Shared Dispositive Power ........................................................................................      

11. Aggregate Amount Beneficially Owned by Each Reporting Person. 2,608,695.............  

12. Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See    Instructions) 

13. Percent of Class Represented by Amount in Row (11) 9.3% 

14. Type of Reporting Person (See Instructions) CO . 

**Item 1. Security and Issuer**

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Common Stock, $.001 par value of ViroLogic, Inc. , 345 Oyster Point Blvd.,    South San Francisco, CA 94080-1913.

**Item 2. Identity and Background**

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(a) Pfizer Ireland Pharmaceuticals 

(b) Pottery Road, Dun Laoire, Co. Dublin, Ireland 

(c) Ownership and manufacture of pharmaceutical products for sale and distribution.  

(d) No 

(e) No 

(f) Republic of Ireland. 

**Item 3. Source and Amount of Funds or Other Consideration**

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Working Capital. 

**Item 4. Purpose of Transaction**

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Investment. 

**Item 5. Interest in Securities of the Issuer**

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(a) 2,608,695 shares; 9.3% 

(b) 2,608,695 shares 

(c) Pfizer Ireland Pharmaceuticals purchased 2,608,695 shares of the common    stock, $.001 par value of ViroLogic, Inc. on November 19, 2002 for cash equal    to $3,000,000 ($1.15 per share) 

(d) N.A.. (e) N.A.. 

**Item 6. Contracts, Arrangements, Understandings or Relationships with Respect  to Securities of the Issuer**

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On November 12, 2002, Pfizer Ireland Pharmaceuticals ("PIP") and ViroLogic,    Inc. entered into a Stock Purchase Agreement, which provided for the sale    of 2,608,695 shares of the common stock of ViroLogic, Inc. for a purchase    price of $3,000,000. The agreement contains customary representations, warranties    and covenants for agreements of this sort, including a representation by PIP    that it was acquiring the shares for its own account, for investment and with    no present intention to distribute the shares being purchased except in compliance    with applicable securities laws. 

**Item 7. Material to Be Filed as Exhibits**

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None.. 

**Signature**

After reasonable inquiry and to the best of my knowledge and belief, I certify  that the information set forth in this statement is true, complete and correct.

January 16, 2003( Date)

 Signature             /s/  Ciaran Keaney                             Ciaran  Keaney - Company Secretary - Pfizer Ireland Pharmaceuticals                             (  Name/Title) 

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CUSIP No. 92823R201................................. 

1. Names of Reporting Persons.     I.R.S. Identification Nos. Of above persons (entities only). 

Pfizer Ireland Pharmaceuticals - No EIN Number 

2. Check the Appropriate Box if a Member of a Group (See Instructions) 

(a) 

(b) 

3. SEC Use Only ........................................................................................  

4. Source of Funds (See Instructions) ......WC..................................................  

5. Check if Disclosure of Legal Proceedings Is Required Pursuant to Items    2(d) or 2(e) 

6. Citizenship or Place of Organization Republic of Ireland 

Number of Shares Beneficially Owned by Each Reporting Person With:

7. Sole Voting Power.. 2,608,695............. 

8. Shared Voting Power 

9. Sole Dispositive Power 2,608,695 

10. Shared Dispositive Power ........................................................................................      

11. Aggregate Amount Beneficially Owned by Each Reporting Person. 2,608,695.............  

12. Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See    Instructions) 

13. Percent of Class Represented by Amount in Row (11) 9.3% 

14. Type of Reporting Person (See Instructions) CO . 

**Item 1. Security and Issuer**

Common Stock, $.001 par value of ViroLogic, Inc. , 345 Oyster Point Blvd.,    South San Francisco, CA 94080-1913.

**Item 2. Identity and Background**

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(a) Pfizer Ireland Pharmaceuticals 

(b) Pottery Road, Dun Laoire, Co. Dublin, Ireland 

(c) Ownership and manufacture of pharmaceutical products for sale and distribution.  

(d) No 

(e) No 

(f) Republic of Ireland. 

**Item 3. Source and Amount of Funds or Other Consideration**

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Working Capital. 

**Item 4. Purpose of Transaction**

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Investment. 

**Item 5. Interest in Securities of the Issuer**

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(a) 2,608,695 shares; 9.3% 

(b) 2,608,695 shares 

(c) Pfizer Ireland Pharmaceuticals purchased 2,608,695 shares of the common    stock, $.001 par value of ViroLogic, Inc. on November 19, 2002 for cash equal    to $3,000,000 ($1.15 per share) 

(d) N.A.. (e) N.A.. 

**Item 6. Contracts, Arrangements, Understandings or Relationships with Respect  to Securities of the Issuer**

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On November 12, 2002, Pfizer Ireland Pharmaceuticals ("PIP") and ViroLogic,    Inc. entered into a Stock Purchase Agreement, which provided for the sale    of 2,608,695 shares of the common stock of ViroLogic, Inc. for a purchase    price of $3,000,000. The agreement contains customary representations, warranties    and covenants for agreements of this sort, including a representation by PIP    that it was acquiring the shares for its own account, for investment and with    no present intention to distribute the shares being purchased except in compliance    with applicable securities laws. 

**Item 7. Material to Be Filed as Exhibits**

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None..