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- Wallensten, Anders, et al.
(author)
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Surveillance of influenza A virus in migratory waterfowl in northern Europe
- 2007
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In: Emerging Infectious Diseases. - 1080-6040 .- 1080-6059. - 1080-6040 ; 13:3, s. 404-411
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Journal article (peer-reviewed)abstract
- We conducted large-scale, systematic sampling of influenza type A virus in migratory waterfowl (mostly mallards [Anas platyrhynchos]) at Ottenby Bird Observatory, southeast Sweden. As with previous studies, we found a higher prevalence in fall than spring, and among juveniles compared with adults. However, in contrast to other studies, we found that prevalence in spring was sometimes high (mean 4.0%, highest 9.5%). This finding raises the possibility that ducks are capable of perpetuating influenza A virus of different subtypes and subtype combinations throughout the year and from 1 year to the next. Isolation of the H5 and H7 subtypes was common, which suggests risk for transmission to sensitive domestic animals such as poultry. We argue that wild bird screening can function as a sentinel system, and we give an example of how it could have been used to forecast a remote and deadly outbreak of influenza A in poultry.
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2. |
- Wallensten, Anders, et al.
(author)
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High prevalence of influenza A virus in ducks caught during spring migration through Sweden
- 2006
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In: Vaccine. - : Elsevier BV. - 0264-410X .- 1873-2518. ; 24 (44-46), s. 6734-6735
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Journal article (peer-reviewed)abstract
- As part of our ongoing screening of wild birds in Northern Europe, 358 mallards (Anas platyrhynchos) and 203 shelducks (Tadorna tadorna) were caught in southern Sweden during the spring 2003. Faecal samples were analyzed by real time RT-PCR for the presence of influenza A virus. In contrast to what has been found in North American studies, Eurasian spring migrating ducks passing through Sweden had a relatively high prevalence of influenza A virus. © 2006 Elsevier Ltd. All rights reserved.
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