Contacts of the confirmed cases are being closely monitored, according to the World Health Organisation's disease outbreak update.
As of April 20, China's National Health and Family Planning Commission notified WHO of an additional 5 laboratory-confirmed cases of human infection with avian influenza A(H7N9) virus. Of the latest laboratory confirmed cases, three are from Zhejiang Province, one is from Shanghai Municipality, and one is from Jiangsu Province.