H5N1 bird flu might be more prevalent among humans than public health data shows

As H5N1 bird flu continues to spread around the US, health officials recently found that 7 percent of dairy workers tested on farms in two states had evidence of recent infection — and some had signs of infection even when they didn’t feel sick.

On Monday, the US Department of Agriculture reported 491 cattle herds had been infected in 15 states, including a quarter of California’s dairy herds. In the last 30 days, the department said that more than 20 flocks of chickens and turkeys were confirmed to have bird flu.

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