So far there is only one confirmed human case. Rick Bright, an expert on the H5N1 virus who served on President Joe Biden’s coronavirus advisory board, told me this is the crucial moment. “There’s a fine line between one person and 10 people with H5N1,” he said. “By the time we’ve detected 10, it’s probably too late” to contain.

H5N1 avian flu virus is spreading in cattle herds. Former surgeon general Jerome Adams, who served on Trump's COVID task force, is getting deja vu.

Detection of bird flu virus in cow milk raises concerns. Experts assure low human risk due to pasteurization. Ongoing monitoring ensures food safety.

Avian influenza, aka bird flu, has spread to dairy cows in multiple states and one person in Texas. What to know about transmission, symptoms and food risks.