Exhibit 31.2

Certification Pursuant to Rule 13a-14(a)

I, James A. McNulty, hereby certify that:

1. I have reviewed the Quarterly Report on Form 10-QSB of Biovest International, Inc. for the quarter ended March 31, 2006;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in
light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my
knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the small business issuer as of, and for, the
periods presented in this report;

4. The small business issuers other certifying officer and I are responsible for establishing and maintaining
disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the small business issuer and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure
that material information relating to the small business issuer, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide
reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the small business issuers disclosure controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in
this report any change in the small business issuers internal control over financial reporting that occurred during the small business issuers most recent fiscal quarter (the small business issuers fourth fiscal quarter in the case
of an annual report) that has materially affected, or is reasonably likely to materially affect, the small business issuers internal control over financial reporting; and

5. The small business issuers other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the small business issuers auditors and the
audit committee of the small business issuers board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies
and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the small business issuers ability to record, process, summarize and report financial information;
and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the small business issuers
internal control over financial reporting.



|                   |  |                                                        
|------------------ |  | -------------------------------------------------------
|Date: May 22, 2006 |  | /s/ James A. McNulty                                   
|                   |  | James A. McNulty, Secretary and Chief Financial
Officer