![](https://i.cbc.ca/1.7273992.1721845421!/fileImage/httpImage/image.jpg_gen/derivatives/16x9_620/bird-flu-h5n1-avian-influenza.jpg)
Human H5N1 cases in the U.S. are rising. That's bad timing with flu season, bird migrations just months away
The sheer scale of the U.S. bird flu outbreak is hard to fathom. More than 100 million farmed birds have been infected with H5N1 since 2022, followed by roughly 170 herds of dairy cows, along with virus detections in more than 200 other mammals — humans …