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The U.S. Department of Agriculture is now testing the nation’s milk supply for the bird flu virus known as H5N1. The virus has spread through dairy cattle in 16 states, including most of the Mountain West.

Federal health officials are calling for more testing and treatment of workers on farms with bird flu. The new guidance comes after a study showed that some dairy workers had signs of infection, even when they didn’t report feeling sick.

Hundreds of emails from state and local health departments provided via public records requests share insight on the spike of bird flu cases happening in the country.

Avian flu cases in Colorado have led to farms losing entire flocks of hens in places like Weld County. One egg-producing facility in the area, Opal Farms, paid $10 million to sanitize their facility after losing their birds.

Greeley dairy workers, mostly Spanish-speaking, have come down with conjunctivitis and flu-like symptoms that they fear to be bird flu, but their employers have given them nothing besides gloves for their protection.

It was over 100 degrees last week when 160 workers in Colorado were culling 1.8 million chickens with avian flu at a commercial egg-laying facility.

Avian flu continues to spread in dairy cows with more than 130 herds affected nationwide. Colorado and Idaho have seen the highest number of cases.