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Virologists plan influenza H7N9 gain of function experiments

A group of virologists lead by Yoshihiro Kawaoka and Ron Fouchier have sent a letter to Nature and Science outlining the experiments they propose to carry out with influenza H7N9 virus. Avian influenza H7N9 virus has caused over 130 human infections in China with 43 fatalities. The source of the virus is not known but is suspected to be wet market poultry. No human to human transmission have been detected, and the outbreak seems to be under control. According to the authors of the letter, the virus could re-emerge this winter, and therefore additional work is needed to assess the risk of human infection. The research that the virologists propose involve gain-of-function experiments which provide the H7N9 virus with new properties. The isolation of avian influenza H5N1 viruses that can transmit by aerosol among ferrets is an example of a gain-of-function experiment.

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