Chiron to Release Earnings on Wednesday, January 26, 2005; Conference

    Business Editors/Health/Medical Writers
    BIOWIRE2K

    EMERYVILLE, Calif.--(BUSINESS WIRE)--Jan. 12, 2005--Chiron Corporation (Nasdaq:CHIR) today announced that it will release its fourth-quarter 2004 financial results on Wednesday, January 26, at 4:00 p.m. EST.
    Forty-five minutes later, at 4:45 p.m. EST, as part of its efforts to ensure full disclosure to all parties, Chiron will webcast an earnings discussion conference call live from Chiron.com.
    To access either the live conference call or the one-week archive, please log on to www.chiron.com/webcast. Please connect to the website at least 15 minutes prior to the conference call to ensure adequate time to download any necessary software. Alternatively, please call (800) 819-7026 from the United States or Canada or (706) 643-7768 from other locations. Replay is available approximately two hours after the completion of the call through 11:55 p.m. EST, Wednesday, February 2, 2005. To access the replay, please call (800) 642-1687 from the United States or Canada or (706) 645-9291 from other locations. The conference ID number is 3315882.

    About Chiron

    Chiron delivers innovative and valuable products to protect human health by advancing pioneering science across the landscape of biotechnology. The company works to deliver on the limitless promise of science and make a positive difference in people's lives. For more information, please visit www.chiron.com.

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CONTACT: Chiron Corporate Communications & Investor Relations Media, 510-923-6500 Investors, 510-923-2300

KEYWORD: CALIFORNIA INDUSTRY KEYWORD: PHARMACEUTICAL MEDICAL BIOTECHNOLOGY EARNINGS CONFERENCE CALLS SOURCE: Chiron Corporation

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