H9N2
Low-pathogenicity avian influenza subtype; parts donor for more dangerous H5 and H7N9 reassortants.
H9N2, a low-pathogenicity avian influenza subtype, infected three more people in China between 10 and 16 July 2026; it matters chiefly as a genetic donor to more dangerous H5 and H7N9 strains.
Last refreshed: 31 July 2026 · Appears in 1 active topic
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Pandemics and BiosecurityBackground
H9N2 is a low-pathogenicity avian influenza A subtype that infects humans rarely and kills them rarer still: 173 human cases worldwide since 2015, with two deaths, most in China and nearly all in young children with mild illness.
Virologists watch it mainly because its internal gene segments turn up inside H5N1 and H7N9 reassortants, making it a genetic donor to more dangerous strains rather than a direct threat in its own right.
WHO reported three new Chinese infections between 10 and 16 July 2026, with a 44-year-old man in intensive care while two four-year-old boys recovered. Because it circulates quietly and often undetected in poultry populations across multiple countries, sustained surveillance of H9N2 is treated as an early-warning function for the next reassortant strain rather than an outbreak response in its own right.
What is H9N2 avian influenza?
How dangerous is H9N2 to humans?
Why do scientists monitor H9N2 closely?
When were the latest human H9N2 cases reported?
