2 dead in China from unusual bird flu strain
Nine potential subtypes of H7 viruses are known (H7N1, H7N2, H7N3, H7N4, H7N5, H7N6, H7N7, H7N8, and H7N9). Most H7 viruses identified worldwide in wild birds and poultry are LPAI viruses. H7 virus infection in humans is uncommon, but has been documented in persons who have direct contact with infected birds, especially during outbreaks of H7 virus among poultry. Illness in humans may include conjunctivitis and/or upper respiratory tract symptoms. In humans, LPAI (H7N2, H7N3, H7N7) virus infections have caused mild to moderate illness, and HPAI (H7N3, H7N7) virus infections have caused mild to severe and fatal illness.
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