H7N9 avian flu

H7N9 refers to a subgroup of H7 influenza viruses that normally circulates among birds. Human infections of H7N9 have been reported in parts of China, with some people dying of severe pneumonia.

A 69-year-old man from Hebei who contracted the H7N9 virus had been in contact with live poultry before he fell ill. Photo: SCMP Pictures

Four new H7N9 cases reported in north China

Two new cases of H7N9 infection have been reported in Henan province, local health authorities said on Sunday, taking the number of news case in northern China in recent days to four.