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The US is entering a riskier season for spread of H5N1 bird flu; Missouri case still a mystery

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With the approach of fall and cooler weather across the United States, officials say the risk posed by the H5N1 bird flu virus could rise — and they’re taking steps to prevent the creation of a hybrid flu virus that could more easily infect humans.

Fall and winter months present more opportunities for H5N1 to spread and change since both cows and other flu viruses will be on the move. While most human infections in the current outbreak have been mild and self-limiting, each new host gives the virus a chance to get better at infecting people.

... the concern comes as scientists are urgently trying to solve the mystery of how a person in Missouri who had no contact with animals became infected by a type of bird flu.

 

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