"Prionics praises the approach taken by the USDA and its decision to bolster the already aggressive surveillance, detection and response program," said Dr. Bruno Oesch, president and CEO of Prionics. "The USDA's additional actions will further strengthen U.S. prevention systems and the confidence of both consumers and customers around the world."

Prionics-Check WESTERN is the most accurate rapid-test procedure in the world. It has been used on more than 15 million cattle samples worldwide, and there have been no false positives recorded. Prionics AG has more than 50 percent share of the world market for BSE testing procedures, and it is the only company with two high-throughput BSE tests approved by EU. The two tests form a complementary and compatible BSE test system.

Prionics-Check WESTERN detects BSE using three independent criteria:

• recognition of the disease-related prion protein by the antibody provided;
• a decrease of molecular weight of the detected protein following protease digestion;
• the characteristic three-band pattern of the protein reflecting its glycosylation status.

Prionics-Check WESTERN is also the only recommended test for highly compromised tissue samples.

Prionics' surveillance concept led to the establishment of official EU-wide BSE screening programs in 2001, and the Prionics-Check WESTERN is the preferred test in these programs. Canada adopted the Prionics-Check WESTERN in May of 2003 for the initial evaluation of their BSE situation, and BSE-free countries such as Australia, New Zealand, Argentina, Chile and others have also adopted this technology, in agreement with guidelines of the
'"/>

Contact: Todd Ringler
todd.ringler@edelman.com
617-872-1235
Edelman Public Relations
31-Dec-2003