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The milk produced by mammals after parturition, colostrum, is rich in antibodies. Cows produce particularly large amounts of colostrum. These investigators immunized pregnant cows with antigens from enterotoxigenic E. coli, the commonest cause of travelers' diarrhea, and then harvested the antibodies in the cows' colostrum. Ten subjects received these antibodies, and ten controls received colostrum containing no anti-E. coli antibodies. All 20 subjects then received large oral doses of enterotoxigenic E. coli. None of the 10 subjects who received the anti-E. coli antibodies had diarrhea, but nine of the 10 controls did. The passive immunization induced by the anti-E. coli antibodies did not prevent the bacteria from colonizing the intestine…