President-elect Donald Trump must contend with the H5N1 bird flu virus circulating among livestock, which experts fear could be the next pandemic.

Here’s what to know about the United States’ first confirmed severe case of H5N1 avian influenza—and how to protect yourself.

The bird flu virus found in a severely ill patient hospitalized in the United States has mutated to become better adapted to human airways, though there is no evidence it has spread beyond the individual,

The Centers for Disease Control and Prevention said Thursday that a single severe case of bird flu detected in a Louisiana man shows a rare mutation of the virus. The patient’s samples showed mutations in the hemagglutinin (HA) gene,