Affinity purified polyclonal antibody to E. coli O157:H7 made in goat and labeled with horseradish peroxidase. Isolated from a serum pool of goats immunized with heat-killed whole cells of E. coli serotype O157. The antibody is highly specific for E. coli O157:H7. Product is in lyophilized form. Each lot is tested to assure specificity and lot-to-lot consistency using an in-house ELISA assay.