HERCULES, CA and FULLERTON, CA -- (MARKET WIRE) -- May 31, 2007 -- Bio-Rad Laboratories, Inc. (AMEX: BIO) (AMEX: BIOb), and Beckman Coulter, Inc. (NYSE: BEC), today announced an eight-year extension of a development and manufacturing agreement between the companies in immunodiagnostic testing for blood virus and infectious disease.
