Abstract
The peroxidase-antiperoxidase (PAP) technique was evaluated as a method for detecting enterotoxigenic Escherichia coli (ETEC) K99 pilus antigen in paraffin-embedded tissues of swine. Antigenic reactivity was optimal when tissues were processed in cold methanol according to a modified method of Sainte-Marie. This method of processing adequately preserved tissue morphology. The PAP technique was applicable to tissues where endogenous peroxidase activity was minimal.
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