Journal
INFLUENZA AND OTHER RESPIRATORY VIRUSES
Volume 8, Issue 6, Pages 613-616Publisher
WILEY-BLACKWELL
DOI: 10.1111/irv.12275
Keywords
Avian influenza; H16 subtype; influenza pathogenesis; Mallard duck
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Funding
- Federal Government of Germany (FSI) [1-3.6]
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BackgroundMallard ducks and other waterfowl represent the most important reservoirs of low pathogenic avian influenza viruses (LPAIV). In addition, mallards are the most abundant duck species in Eurasia that migrate over long distances. Despite extended wild bird monitoring studies over the past decade in many Eurasian countries and investigating hundreds of thousands of wild bird samples, no mallard duck was found to be positive for avian influenza virus of subtype H16 in faecal, cloacal or oropharyngeal samples. Just three cases of H16 infections in Anseriformes species were described worldwide. In contrast, H16 viruses have been repeatedly isolated from birds of the Laridae family. ObjectiveHere, we tested the hypothesis that mallards are less permissive to infection with H16 viruses. MethodsGroups of mallard ducks of different age were inoculated via the oculo-nasal-oral route with different infectious doses of an H16N3 AIV. ResultsThe ducks did not show any clinical symptoms, and no virus shedding was evident from cloacal and respiratory routes after experimental infection as shown by negative RT-qPCR results. In addition, all serum samples taken on days 8, 21 and 24 post-inoculation were negative by competitive NP-ELISA. ConclusionsThis study provided evidence that mallards are resistant to infection with H16N3 LPAIV.
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