WHO head Margaret Chan urged caution on Monday at the World Health Assembly in Geneva. “Influenza viruses constantly reinvent themselves. No one can predict the future course of this outbreak," she said. Photo: AP

No new H7N9 cases in China for a week

Topic |   H7N9 virus

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WHO head Margaret Chan urged caution on Monday at the World Health Assembly in Geneva. “Influenza viruses constantly reinvent themselves. No one can predict the future course of this outbreak," she said. Photo: AP
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