Bird flu has been spreading in wild animals for years but it is now adapting to humansVuk Valcic//SOPA Images/LightRocket via Getty ImagesThe threat of the deadly H5N1 bird flu virus adapting to humans has been inching closer towards becoming a reality all year, and we may be nearing an inflection point. Three H5N1 cases in humans have happened in the very scenarios that public health officials are concerned could lead to a pandemic in people.There is no clear evidence yet of human-to-human transmission, but I
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