UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
Amendment No.: 3*
Name of Issuer: Cerus Corporation
Title of Class of Securities: Common Stock

CUSIP Number:  15708510-1

*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 the disclosures provided in a prior cover page.

The information required in 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).

All share information contained in this filing, as it pertains to this
issuer, is as of July 31, 2002.	

CUSIP No.: 15708510-1                                 Page 2 of 8

1.  NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
         Janus Capital Management LLC
         EIN #75-3019302

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
         a.   ___
         b.   _X_

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION
         Colorado

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

    5.   SOLE VOTING POWER
              1,030,895**

    6.   SHARED VOTING POWER
              -0-

    7.   SOLE DISPOSITIVE POWER
              1,030,895**

    8.   SHARED DISPOSITIVE POWER
              -0-

    9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         1,030,895**

    10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
         N/A

11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         6.5%**

12. TYPE OF REPORTING PERSON
         IA, CO

**  See Item 4 of this filing	

CUSIP No.:  15708510-1                           Page 3 of 8

1.  NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
         Janus Global Life Sciences Fund
         EIN #84-1474315

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
         a.   ___
         b.   _X_

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION
         Massachusetts

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

    5.   SOLE VOTING POWER
              700,000**

    6.   SHARED VOTING POWER
              -0-

    7.   SOLE DISPOSITIVE POWER
              700,000**

    8.   SHARED DISPOSITIVE POWER
              -0-

    9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         700,000**

    10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
         N/A

11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         4.4%**

12. TYPE OF REPORTING PERSON
         IV

**  See Item 4 of this filing	

SCHEDULE 13G Page 4 of 8
Item 1.
(a). Name of Issuer: Cerus Corporation ("Cerus")
(b). Address of Issuer's Principal Executive Offices:
2411 Stanwell Dr.
Concord, CA 94520
Item 2.
(a).-(c). Name, Principal Business Address, and Citizenship of Persons Filing:
(1) Janus Capital Management LLC ("Janus Capital") 100 Fillmore Street Denver, Colorado 80206-4923 Citizenship: Colorado
(2) Janus Global Life Sciences Fund 100 Fillmore Street Denver, Colorado 80206-4923 Citizenship: Massachusetts
(d). Title of Class of Securities: Common Stock
(e). CUSIP Number: 15708510-1
Item 3.
Janus Capital is an Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940.
Janus Global Life Sciences Fund is an Investment Company registered under Section 8 of the Investment Company Act of 1940.

SCHEDULE 13G Page 5 of 8
Item 4. Ownership
The information in items 1 and 5 through 11 on the cover pages (pp. 2-
4) on Schedule 13G is hereby incorporated by reference.
Janus Capital is a registered investment adviser which furnishes investment advice to several investment companies registered under
Section 8 of the Investment Company Act of 1940 and individual and institutional clients (collectively referred to herein as "Managed Portfolios"). As a result of its role as investment adviser or sub- adviser to the Managed Portfolios, Janus Capital may be deemed to be the beneficial owner of the shares of Cerus Common Stock held by such Managed Portfolios. However, Janus Capital does not have the right to receive any dividends from, or the proceeds from the sale of, the securities held in the Managed Portfolios and disclaims any ownership associated with such rights.
Janus Global Life Sciences Fund is an investment company registered under the Investment Company Act of 1940 and is one of the Managed Portfolios to which Janus Capital provides investment advice.

SCHEDULE 13G Page 6 of 8
Item 5. Ownership of Five Percent or Less of a Class
This statement is being filed to report the fact that Janus Global Life Sciences Fund has ceased to be the beneficial owner of more than five percent of the class of securities.
Item 6. Ownership of More than Five % on Behalf of Another Person
Janus Capital's Managed Portfolios, set forth in Item 4 above, have the right to receive all dividends from, and the proceeds from the sale of, the securities held in their respective accounts.
The interest of any one person does not exceed 5% of the class of securities.
These shares were acquired in the ordinary course of business, and not with the purpose of changing or influencing control of the Issuer.
Item 7. Identification and Classification of the Subsidiary Which
Acquired the Security Being Reported on by the Parent Holding Company
N/A
Item 8. Identification and Classification of Members of the Group
N/A
Item 9. Notice of Dissolution of Group
N/A
Item 10. Certification
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purposes or effect.

SCHEDULE 13G Page 7 of 8
SIGNATURES
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.
JANUS CAPITAL MANAGEMENT LLC

By  /s/  Heidi J. Walter                       8/9/02
  Heidi J. Walter,                                  Date
    Vice President & Assistant General Counsel	

JANUS GLOBAL LIFE SCIENCES FUND

By  /s/  Heidi J. Walter                       8/9/02
  Heidi J. Walter,                                  Date
    Vice President & Assistant General Counsel	

SCHEDULE 13G Page 8 of 8
EXHIBIT A
JOINT FILING AGREEMENT
In accordance with Rule 13d-1(f) under the Securities Exchange Act of 1934, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13G (including amendments thereto) with respect to the Common Stock of Cerus Corporation and further agree that this Joint Filing Agreement be included as an Exhibit to such joint filings. In evidence thereof, the undersigned hereby execute this Agreement as of the 9th day of August, 2002.
JANUS CAPITAL MANAGEMENT LLC

By  /s/  Heidi J. Walter
   Heidi J. Walter, Vice President & Assistant General Counsel

JANUS GLOBAL LIFE SCIENCES FUND

By  /s/  Heidi J. Walter
   Heidi J. Walter, Vice President & Assistant General Counsel