As bird flu cases rise in the US, experts weigh the potential threat to public health and whether the virus could mutate into a devastating pandemic.
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The CDC has confirmed 66 cases of H5N1 bird flu in the US, with one severe hospitalization in Louisiana - a stark reminder of the virus's potential to jump from poultry to humans.
While human-to-human transmission has not yet been reported, infectious disease experts warn that continued spread in bird populations increases the chances of the virus mutating and becoming more transmissible between people.
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Elizabeth Yuko, Centers for Disease Control and Prevention (CDC)