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Two hundred and forty-eight blood samples obtained from 139 mammals, 107 birds and 2 reptiles were tested for neutralizing antibodies against St. Louis encephalitis virus. Eleven, or 10.3%, of the avian specimens and two, or 1.4%, of the mammalian specimens neutralized this virus.
* This investigation was supported in part by research grant E-1941 from the National Institutes of Health, U. S. Public Health Service.
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