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Birds and Viruses at a Crossroad - Surveillance of Influenza A Virus in Portuguese Waterfowl

Tolf, Conny; Bengtsson, Daniel LU ; Rodrigues, David; Latorre-Margalef, Neus LU ; Wille, Michelle; Figueiredo, Maria Ester; Jankowska-Hjortaas, Monika; Germundsson, Anna; Duby, Pierre Yves and Lebarbenchon, Camille, et al. (2012) In PLoS ONE 7(11).
Abstract

During recent years, extensive amounts of data have become available regarding influenza A virus (IAV) in wild birds in northern Europe, while information from southern Europe is more limited. Here, we present an IAV surveillance study conducted in western Portugal 2008-2009, analyzing 1653 samples from six different species of waterfowl, with the majority of samples taken from Mallards (Anas platyrhynchos). Overall 4.4% of sampled birds were infected. The sampling results revealed a significant temporal variation in the IAV prevalence, including a pronounced peak among predominantly young birds in June, indicating that IAV circulate within breeding populations in the wetlands of western Portugal. The H10N7 and H9N2 subtypes were... (More)

During recent years, extensive amounts of data have become available regarding influenza A virus (IAV) in wild birds in northern Europe, while information from southern Europe is more limited. Here, we present an IAV surveillance study conducted in western Portugal 2008-2009, analyzing 1653 samples from six different species of waterfowl, with the majority of samples taken from Mallards (Anas platyrhynchos). Overall 4.4% of sampled birds were infected. The sampling results revealed a significant temporal variation in the IAV prevalence, including a pronounced peak among predominantly young birds in June, indicating that IAV circulate within breeding populations in the wetlands of western Portugal. The H10N7 and H9N2 subtypes were predominant among isolated viruses. Phylogenetic analyses of the hemagglutinin and neuraminidase sequences of H10N7, H9N2 and H11N3 virus showed that sequences from Portugal were closely related to viral sequences from Central Europe as well as to IAVs isolated in the southern parts of Africa, reflecting Portugal's position on the European-African bird migratory flyway. This study highlights the importance of Portugal as a migratory crossroad for IAV, connecting breeding stationary waterfowl with birds migrating between continents which enable transmission and spread of IAV.

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subject
in
PLoS ONE
volume
7
issue
11
publisher
Public Library of Science
external identifiers
  • scopus:84868686374
ISSN
1932-6203
DOI
10.1371/journal.pone.0049002
language
English
LU publication?
no
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9064cd84-4fca-4e29-88a3-51210d13b832
date added to LUP
2017-04-11 14:04:41
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2017-09-10 05:17:50
@article{9064cd84-4fca-4e29-88a3-51210d13b832,
  abstract     = {<p>During recent years, extensive amounts of data have become available regarding influenza A virus (IAV) in wild birds in northern Europe, while information from southern Europe is more limited. Here, we present an IAV surveillance study conducted in western Portugal 2008-2009, analyzing 1653 samples from six different species of waterfowl, with the majority of samples taken from Mallards (Anas platyrhynchos). Overall 4.4% of sampled birds were infected. The sampling results revealed a significant temporal variation in the IAV prevalence, including a pronounced peak among predominantly young birds in June, indicating that IAV circulate within breeding populations in the wetlands of western Portugal. The H10N7 and H9N2 subtypes were predominant among isolated viruses. Phylogenetic analyses of the hemagglutinin and neuraminidase sequences of H10N7, H9N2 and H11N3 virus showed that sequences from Portugal were closely related to viral sequences from Central Europe as well as to IAVs isolated in the southern parts of Africa, reflecting Portugal's position on the European-African bird migratory flyway. This study highlights the importance of Portugal as a migratory crossroad for IAV, connecting breeding stationary waterfowl with birds migrating between continents which enable transmission and spread of IAV.</p>},
  articleno    = {e49002},
  author       = {Tolf, Conny and Bengtsson, Daniel and Rodrigues, David and Latorre-Margalef, Neus and Wille, Michelle and Figueiredo, Maria Ester and Jankowska-Hjortaas, Monika and Germundsson, Anna and Duby, Pierre Yves and Lebarbenchon, Camille and Gauthier-Clerc, Michel and Olsen, Björn and Waldenström, Jonas},
  issn         = {1932-6203},
  language     = {eng},
  month        = {11},
  number       = {11},
  publisher    = {Public Library of Science},
  series       = {PLoS ONE},
  title        = {Birds and Viruses at a Crossroad - Surveillance of Influenza A Virus in Portuguese Waterfowl},
  url          = {http://dx.doi.org/10.1371/journal.pone.0049002},
  volume       = {7},
  year         = {2012},
}