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Serum specimens from 1,844 persons were tested for hemagglutination-inhibition antibodies against the A/Swine/Illinois/1/63 strain of influenza virus. Antibody was found in 28 per cent, with the highest prevalence in persons born before 1921. Serologic evidence of occupation-related infections was found in hog producers, veterinarians, and abattoir workers. An increase in the prevalence of antibody in one community between June 1965 and July 1966 was unexplained.
Schnurrenberger et al. (Tue,) studied this question.