Abstract
Monkeys were immunized with enterotoxin and enterotoxoid by intracutaneous injection or by feeding. Identical schedules were used to compare the effectiveness of the two antigens and the two routes. Enterotoxin administered intracutaneously was the most effective antigen, whereas oral administration of enterotoxoid was least effective. Intracutaneous injection of toxoid and oral feeding of toxin were intermediate and not too dissimilar in effectiveness. Antibody titers and protection persisted for at least 1 year at a relatively high level. Monkeys that had preimmunization hemagglutinins showed an anamnestic response after immunization. The development of protection and the appearance of antibodies subsequent to feeding toxin or toxoid suggest that ingestion of food contaminated by staphylococci or their metabolites may be one cause for the appearance of antitoxin in the serum of supposedly unexposed animals and man.
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Selected References
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