Human-to-Human Transmission of Bird Flu Discovered in China

China's National Disease Authority has confirmed that a man whose 24-year-old son died of the H5N1 strain of bird flu is also infected with the disease, raising concerns about human transmission of the virus.

H5N1 is a particularly virulent and lethal strain of the influenza virus that primarily infects domestic and wild birds. So far, it does not spread easily between birds and humans, but health officials fear that it could mutate into a form that is highly contagious from human to human. Given the intensely lethal nature of the disease, such a strain could easily lead to a global health crisis.

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