Summary
The sites of replication of influenza A viruses in ferrets and pigs were studied. The majority of the swine, equine, and avian influenza A viruses tested were recovered from the intestinal tract of ferrets as well as from the respiratory tract; most of the human influenza viruses studied were recovered only from the respiratory tract. In contrast with ferrets, only Hong Kong/1/68 (H 3 N 2) influenza virus was recovered from the intestinal tract of pigs. Despite the large biological variability found in ferrets and in pigs, the results do establish that the majority of influenza viruses have the potential to replicate in the intestinal tissues of some mammals. Additionally, the study suggests that there are differences among the influenza A viruses in tissue tropism in different mammals. Both viral and host genetic factors determine the tissue tropism of influenza viruses in mammals.
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Kawaoka, Y., Bordwell, E. & Webster, R.G. Intestinal replication of influenza A viruses in two mammalian species. Archives of Virology 93, 303–308 (1987). https://doi.org/10.1007/BF01310984
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DOI: https://doi.org/10.1007/BF01310984