H7N9 avian flu

The influenza A (H7N9) virus is one subgroup among the larger group of H7 viruses that normally circulate among birds. A number of human infections of the H7N9 virus have been reported in eastern China, mostly in the Yangtze River Delta region since late March 2013. Some of the patients have died of severe pneumonia brought on by the virus.  

A security guard wearing a face mask stands guard at a poultry market which has been closed by local government officials in Nanjing, eastern  China's Jiangsu province. Photo: AP

One more H7N9 virus death in Shanghai

Three new cases of H7N9 avian influenza were reported in eastern China on Monday, bringing the total number of deaths in the country to seven.