Avian Influenza A(H7N9) Virus

human infection with reassortant avian influenza A(H7N9) virus oc-curred in eastern China. A total of 135 laboratory-confirmed cases and 44 deaths among case-patients have been reported as of August 11, 2013. Unlike infection with other H7 sub-type viruses (e.g., H7N2, H7N3, and H7N7), which often cause mild-to-moderate-human disease (1), infec-tion with H7N9 subtype virus caused severe pneumonia and acute respira-tory distress syndrome in most labo-ratory-confirmed case-patients (2,3). Pregnant women are particularly sus