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H7N9 virus

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 man, involved in the chicken business for 16 years, watches as Zijinshan market closes down on Saturday morning due to concerns about avian flu. Photo: Simon Song

China steps up response to bird flu cases

A second Chinese city culled birds on Saturday to prevent the spread of H7N9 avian influenza, which has killed six people in the country, as Shanghai’s live poultry markets remained shut.