Bird flu has been spreading in wild animals for years but it’s now adapting to humans
Vuk Valcic//SOPA Images/LightRocket via Getty Images
The threat of the deadly H5N1 bird flu virus adapting to h… [+326 chars]
Three people in North America without known animal exposures have tested positive for the bird flu virus H5N1, and samples from two of them suggest the virus is adapting to humans
