Abstract
Culture fluids of 4 type A, 6 type B, and 1 type EClostridium botulinum strains were compared for their toxicities in 9–11-day-old (infant) and adult mice. In intraperitoneal challenges, most toxins were about equally potent for infants and adults; the exceptions were 4 type B preparations, which were 500 to 5,000 times more lethal for infants. In orogastric challenges, samples were 10 to >15,000 times more toxic for infants, and the previously mentioned type B toxins constituted a group having the highest relative toxicity for infants.
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