DETERMINE IF REVALIDATION IS REQUIRED FOR CHANGES IN SAMPLE SIZE OR MATRIX ON E. COLI O157:H7 DETECTION TESTS

1. Determine if validated rapid tests for E. coli O157:H7 require revalidation for use at a different sample size (i.e., 25 g versus 325 g). 2. Determine if validated rapid tests for E. coli O157:H7 require revalidation for use in a different sample matrix (i.e., sponge sample versus ground beef). 3. Determine the necessary conditions required to ensure stability of an E. coli O157:H7 enrichment during inter-lab shipping.