H5N1 bird flu is likely infecting more people than we know.

This year, H5N1 has spread widely among dairy cattle and other livestock in the United States.

This suggests that the virus had likely just spread from cows to these workers.

Dairy Cow

© Peter Wade via Getty

So the confirmed human cases found to date are almost certainly a substantial underestimate of the true toll.

The CDC researchers say more is clearly needed to track and prevent the spread of H5N1 on dairy farms.

These efforts should be coupled with farmworker education about infection risks and prevention measures.

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