Influenza viral infection of swine in the United States 1988–1989
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- Chambers, T.M., Hinshaw, V.S., Kawaoka, Y. et al. Archives of Virology (1991) 116: 261. doi:10.1007/BF01319247
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Swine are an animal reservoir for influenza viruses capable of causing disease in humans. A serological survey in 1988–1989 demonstrates that subtype H1 influenza viruses continue to circulate at high frequency among swine in the north-central U.S.A. (average 51% incidence). Subtype H3 viruses antigenically similar to current human H3 viruses are circulating at low frequency (average 1.1%), particularly in the southeast U.S.A.