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US has first severe bird flu case. When should we start to worry?

USA Today
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An older person in Louisiana was "severely" ill after being infected by poultry from a backyard flock.

The patient is one of 61 people identified infected in the U.S. so far this year .

In other countries, bird flu has killed about half of those known to be infected, but here in the United States there have been no deaths and only mild illnesses until this week .

CDC reported 61 confirmed cases of bird flu in the U.S. Multiple experts say the real figure is likely higher.

If the virus continues to infect more people and animals, it will have more opportunities to mutate.

It's impossible to guess whether bird flu will eventually become a more significant threat, expert says.