Are all of the currently reported outbreaks in birds equally dangerous for humans?
In assessing risks to human health, it is important to know exactly which avian virus strains are causing the outbreaks in birds. For example, the outbreak of avian influenza recently reported in Taiwan, China is caused by the H5N2 strain, which is not highly pathogenic in birds and has never been known to cause illness in humans. The outbreak recently announced in Pakistan is caused by H7 and H9 strains, and not by H5N1.
However, urgent control of all outbreaks of avian influenza in birds ? even when caused by a strain of low pathogenicity ?is of utmost importance. Research has shown that certain avian influenza virus strains, initially of low pathogenicity, can rapidly mutate (within 6 to 9 months) into a highly pathogenic strain if allowed to circulate in poultry populations.
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