Chiron Acquires Prion Solutions Inc.

September 1, 2004

EMERYVILLE,

EMERYVILLE, Calif.  -- Chiron Corporation announced that it had acquired Prion Solutions Inc., a privately held company based in La Jolla, Calif., focused on research into variant Creutzfeldt-Jakob disease (vCJD) and other prion-related diseases. Financial terms of the acquisition were not disclosed.