Mass infections in wild birds pose a significant risk to vulnerable species, are hard to contain and increase the opportunity for the virus to spill over into people.
A highly infectious and deadly strain of avian influenza virus has infected tens of millions of poultry birds across Europe, Asia, Africa and North America. But scientists are particularly concerned about the unprecedented spread in wild birds — outbreaks pose a significant risk to vulnerable species, are hard to contain and increase the opportunity for the virus to spill over into people.
Although people can catch the virus, infections are uncommon. Only two cases have been reported since October, one each in the United Kingdom and the United States. But scientists are concerned that the high levels of virus circulating in bird populations mean that there are more opportunities for spillover into people.
Ramey adds that only a fraction of cases in wild birds are diagnosed and reported. More monitoring could unveil the true magnitude of wild bird mortality, he says.
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