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Quantitative precipitation of antisera specific for native enterotoxin revealed that 70% and 60%, respectively, of the antigenic determinants of enterotoxins A and C1 of Staphylococcus aureus were inactivated by formaldehyde at pH 5.0 or 7.5 contained large polymers (excluded by Sepharose 2B) and induced strong humoral immune responses in rhesus monkeys. Enterotoxin A inactivated at pH 5.0 or 7.5 was composed mostly of small polymers (excluded by Sephadex G-100 but included by Sepharose 2B); it provoked a poor immune response in monkeys (about equivalent to the response obtained with weakly reactive toxin inactivated at alkaline pH). It was concluded that potent enterotoxoids were formed by extensive cross-linking of enterotoxin C1 into large polymers in acidic or neutral formaldehyde solution.
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