Bird flu typically spreads among birds, but there have been recent outbreaks among cattle in the U.S., and one Texas man contracted the virus from sick cows. Here’s why so many experts are worried about a possible new pandemic.

In response to the outbreak, the USDA has announced that it will be increasing testing in meat processing plants, with a focus on culled dairy cattle.

A Missouri resident has tested positive for bird flu even though there is no evidence the person came into contact with an animal infected with the virus, the Centers for Disease Control and Prevention said in a Friday evening news release.