There are many different bird flu viruses. Besides the subtype H5N1, which has been spreading in the European wild bird population for several years and poses a threat to local poultry farms, there is also, for instance, subtype H7N9. This one caused poultry outbreaks in China from 2013 to 2017 and also infected humans who had close contact with live poultry. A total of 616 people in China were reported to have died from an infection with this subtype.
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