POWER OF ATTORNEY





     Know all by these presents, that the undersigned hereby authorizes Martin

H. Goldstein and William D. Young, or either of them, to execute for and on

behalf of the undersigned, in the undersigned's capacity as a director of

ViroLogic, Inc. (the "Company"), Forms 3, 4 and 5 and any Amendments thereto,

and cause such form(s) to be filed with the Securities and Exchange

Commission pursuant to Section 16(a) of the Securities Exchange Act of 1934,

relating to the undersigned's beneficial ownership of securities in the Company.

The undersigned hereby grants to such attorneys-in-fact full power and authority

to do and perform any and every act and thing whatsoever requisite, necessary,

or proper to be done in the exercise of any of the rights and powers herein

granted, as fully to all intents and purposes as the undersigned might or could

do if personally present, with full power of substitution or revocation, hereby

ratifying and confirming all that such attorneys-in-fact, or substitute or

substitutes of such attorneys-in-fact, shall lawfully do or cause to be done by

virtue of this power of attorney and the rights and powers herein granted.  The

undersigned acknowledges that the foregoing attorneys-in-fact, in serving in

such capacity at the request of the undersigned, are not assuming, nor is the

Company assuming, any of the undersigned's responsibilities to comply with

Section 16 of the Securities Exchange Act of 1934.



     This Power of Attorney shall remain in full force and effect until the

undersigned is no longer required to file Forms 3, 4 and 5 with respect to the

undersigned's holdings of, and transactions in, securities issued by the

Company, unless earlier revoked by the undersigned in a signed writing delivered

to the foregoing attorneys-in-fact.



     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be

executed this 21st day of December, 2000.







                                              /s/ David H. Persing, M.D., Ph.D.

                                              David H. Persing, M.D., Ph.D.















394040 v1/SD

8G1K01!.DOC