An 86-year-old Hongkonger living in Shenzhen has become infected with the H9N2 strain of bird flu - Hong Kong's first human case of the virus strain in four years.
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.
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