According to China's National Health and Family Planning Commission, all three became ill with coughs and fevers before developing pneumonia.

BBC: China bird flu: Two men die in Shanghai

The National Population and Family Planning Commission estimates the population will peak in 2033, when there will be 1.5 billion Chinese.

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According to China's National Health and Family Planning Commission, the men who died in Shanghai became ill with coughs and fevers before developing pneumonia.

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Further surveillance will help in understanding the virus's transmission, said Liang Wannian, director general of the health emergency division of China's National Health and Family Planning Commission.

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An inter-government task force has been formally established, with the National Health and Family Planning Commission leading the coordination along with the Ministry of Agriculture and other key ministries.

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While the source of the virus remains unknown, further surveillance will help in understanding its transmission, said Liang Wannian, director general of the health emergency division of China's National Health and Family Planning Commission.

WSJ: Bird Flu Found Outside China's Mainland

Shanghai's Municipal Health and Family Planning Commission said Thursday it had quarantined a resident who had developed a fever and itchy throat after coming into close contact with one of the patients who had died.

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The Family Planning Commission declined interview requests.

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Liu Zhi, director of the municipal commission for population and family planning, told China Daily on Saturday that the city plans to start extensive research into the characteristics of the urban population.

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