ATLANTA -- Since 2022, a highly contagious strain of bird flu has spread across the U.S. at an unprecedented rate, resulting in the deaths of more than 90 million birds in commercial and backyard poultry flocks, plus thousands more in the wild.

Then, in late March, the virus made a jump to another species that surprised many scientists: cows.

Dairy cattle in eight states have since tested positive for the virus, the U.S. Department of Agriculture’s tracker showed on Tuesday. So far, there have been no reported cases in Georgia.

But there have been other developments that are worrying influenza experts.

On Tuesday, the Food and Drug Administration said it had found inactive fragments of the virus in commercially available pasteurized milk, but said consumers who drink it are not at risk of infection.

“To date, we have seen nothing that would change our assessment that the commercial milk supply is safe,” the FDA said in a statement.

An employee at one of the Texas dairy farms with positive cases in its cows also contracted the virus, the Atlanta-based Centers for Disease Control and Prevention confirmed April 1. The worker’s case is only the second-ever human case reported in the U.S. The man, who worked in close contact with cows and likely caught the virus from cattle, developed only a mild eye infection and has recovered.

The CDC says the threat to the general population remains low and the USDA says there are no signs the virus has changed in ways that could allow it to spread more efficiently to and among people. Still, experts say any transmission from mammals to humans is an unwelcome opportunity for the virus to adapt in ways that could heighten the risk to humans.

The coming weeks could be key to determining whether the virus’ emergence in cows is the start of a growing public health threat or not.

As the situation evolves, here’s what you need to know:

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