Although reports of human infection with avian flu subtypes have been on the decline the past 3 years – undoubtedly due to China’s massive nationwide H7+H5 poultry vaccination programof 2017-  one subtype, not covered by the vaccine, has been on the ascendent; H9N2Ubiquitous in poultry across Asia and in much of the Middle East, LPAI H9N2 occasionally jumps to humans, generally producing only mild to moderate illness. Due to a lack of testing, we are only aware of a few dozen cases (see FluTrackers List), but serological studies suggest human infection is far more common than those numbers would have us believe (see J. Infect & Public Health: High Seroprevalence Of Avian Influenza H9 Among Poultry Professionals In Pakistan)

 

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