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Wild ducks are the reservoir for only a limited number of influenza A subtypes

Published online by Cambridge University Press:  15 May 2009

G. B. Sharp
Affiliation:
Department of Biostatistics and Epidemiology, The University of Tennessee, Memphis, 877 Madison Avenue (Suite 330), Memphis, Tennessee, 38163, USA
Y. Kawaoka
Affiliation:
Department of Virology and Molecular Biology, St Jude Children's Research Hospital, 332 North Lauderdale, Memphis, Tennessee, 38105, USA
S. M. Wright
Affiliation:
Department of Virology and Molecular Biology, St Jude Children's Research Hospital, 332 North Lauderdale, Memphis, Tennessee, 38105, USA
B. Turner
Affiliation:
Canadian Wildlife Service, 4999–98th Avenue (Room 210), Edmonton, Alberta, T6B, 2X3, Canada
V. Hinshaw
Affiliation:
University of Wisconsin-Madison, School of Veterinary Medicine, Department of Pathobiological Sciences, 2015 Linden West, Madison, Wisconsin, 53706, USA
R. G. Webster
Affiliation:
Department of Virology and Molecular Biology, St Jude Children's Research Hospital, 332 North Lauderdale, Memphis, Tennessee, 38105, USA
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Analysis of cloacal samples collected from 12321 wild ducks in Alberta, Canada, from 1976 to 1990 showed influenza A infections to be seasonal, with prevalences increasing as the population became increasingly more dense. Viruses with 3 haemagglutinin (H3, H4, and H6) and 3 neuraminidase subtypes (N2, N6, and N8) were found consistently to infect both adult and juvenile ducks each year, indicating that wild ducks may be a reservoir for these viruses. In contrast, viruses with 7 haemagglutinin (H2, H5, H7, H8, H9, H11, and H12) and 3 neuraminidase subtypes (N1, N3, and N4) were not found for prolonged periods during the study; when they were found, they primarily infected juveniles at moderate levels. Whilst wild ducks appear to perpetuate some influenza A viruses, they apparently do not act as a reservoir for all such viruses.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1993

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