August 15, 2013 -- H7N9 bird flu has killed 45 people on the Chinese mainland since the first human infection was confirmed in late March, a health official said Thursday.
A total of 134 cases of H7N9 infection have been confirmed on the Chinese mainland, said Wang Yu, director of the Chinese Center for Disease Control and Prevention.
Wang was speaking at an international symposium on the prevention and treatment of new types of influenza.
"There are still many unknown aspects of the H7N9 bird flu virus as well as diseases that might result from it, including the source of the virus, the infection routes and mutation," said Wang.
"In particular, the future development of the new bird flu virus is still unclear," he said.
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