Food as a passible source af H5N1 influenza virus infection in mammals

Published: Nov 24, 2017
Food avian influenza mammals
K. van REETH

The recent infections of humans and other mammals with die highly padiogenic H5N1 avian influenza virus have raised questions about the safety of the consumption of poultry products. The aim of this review is to collect and present information regarding the risk of infection in humans with H5N1 virus via the oral route. The presence of virus in edible poultry products and the chances for viral entry via the gastrointestinal (GI) tract, from a pathogenetic point of view, are the main focus points. The transmission of H5N1 from poultry to humans is a rare event which has been associated with very close contact with infected animals. It is generally accepted that the most likely candidate routes for the virus entry are the oropharygeal and/or respiratory tract tissues where virus replication may occur and leading to clinical symptoms. However, the low number of human cases, compared to the high number of humans that have been exposed to H5N1 virus infected animals, shows clearly that a readily accessible portal of entry does not exist. The possibility of virus entry through the GI tract has been proposed, but, so far, no proof that the virus can replicate in the human intestines has been shown. The presence of diarrhoea in several patients and the detection of viral RNA in the intestines and rectal swabs of 3 patients do not allow one to safely conclude that the GI tract can serve as a portal of entry or a target organ. Furthermore, the occurrence of disease has not clearly or definitely been associated with the consumption of poultry meat in any human case. Feline species, on the other hand, have been naturally and experimentally infected after the consumption of infected poultry. However, also in these mammals, it was not established that the intestine is the initial portal of entry of the virus. In conclusion, the possibility that the intestinal tract serves as a portal of entry in mammals remains unlikely, since there is no convincing evidence that the GI tract tissues can support virus replication. It can, however, not be excluded that food containing virus may be a source of infection when passing oropharyngeal tissues, which have been identified as target sites for virus replication.

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