Hong Kong A-2 influenza virus infection among swine during a human epidemic in taiwan

Abstract

THE role of lower animals in the natural cycle of human strains of influenza virus transmission has been subjected to considerable speculation. With the possible exception of the report of Romvary et al.1, there are few, if any, satisfactorily authenticated cases of human influenza viral strains being isolated from naturally infected animals. That animals could be naturally infected was demonstrated when antibodies against the Asian A-2 strain were found in swine and horses after the 1957 pandemic2. © 1970 Nature Publishing Group.