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Influenza A virus prevalence and its implications on survival in mallard

In: Israel Journal of Ecology and Evolution
Authors:
Mauro Giammarino Department of Prevention ASLCN1 – P.zza S

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Piero Quatto Department of Economics, Management and Statistics, University of Milano – Bicocca

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Francesca Rizzo Department of Virology, Istituto Zooprofilattico Sperimentale del Piemonte

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Maria Lucia Mandola Department of Virology, Istituto Zooprofilattico Sperimentale del Piemonte

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Avian influenza is an infectious viral disease of birds caused by type A strains of the influenza virus. Aquatic bird species have adapted to carry and transmit a wide range of influenza strains in nature. Here we report the results of a 4.5-year monitoring program for Orthomyxovirus prevalence in a population of wild mallard (Anas plathyrynchos) in northwestern Italy. To determine whether Orthomyxovirus prevalence affects survival, we used MARK software to compare the survival of AIV-positive versus AIV-negative birds. Prevalence rates and variance were estimated using inverse sampling method. The prevalence rate of influenza A virus was 4.3% (SE 0.00116) and lifespan was shorter (29.8%) for the young infected birds than for the young non-infected birds.

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