On 10 April 2015, the National Health and Family Planning Commission (NHFPC) of China notified WHO of 20 additional laboratory-confirmed cases of human infection with avian influenza A (H7N9) virus, including 4 deaths.

Onset dates ranged from 14 February to 21 March 2015. Cases ranged in age from 32 to 80 years with a mean age of 55 years. Of these 20 cases, 15 (75%) were male. The majority (18 cases, 90%) reported exposure to live poultry. One case is a health care worker, who had also poultry exposure. No clusters were reported. Cases were reported from five provinces: Anhui (3), Fujian (2), Guangdong (4), Shandong (1), and Zhejiang (10).