The world is unprepared for a massive virus outbreak, the deputy chief of the World Health Organisation warned on Tuesday, amid fears that H7N9 bird flu striking China could morph into a form that spreads easily among people.
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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