Texas Screwworm Cases Prompt Indiana to Issue Animal Restrictions

I did not have "flesh-eating parasites" on my 2026 BINGO card, but it's been a long time since I have been surprised by nature doing "crazy" things. From murder hornets to ticks taking over, I don't know about you, but it makes me want to just stay inside.

New World Screwworm

Screwworm flies are about the same size as a common house fly. They get their nasty name from their nasty behavior. Leaving their maggots on unsuspecting animals or humans, which "screw" their way into the body, usually through an open wound. The stuff of nightmares. Ick!

Where Have Screwworms Been Found in the U.S.?

 The U.S. Department of Agriculture Animal and Plant Health Inspection Services has been monitoring the situation. This is not currently a threat to food supplies, but they are providing guidance to livestock farmers, veterinarians, pet owners, and more to make sure that it stays that way.

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How Many Screwworm Cases Have Been Reported in the U.S?

The AP has reported, "So far, there are five confirmed cases: three calves and a goat in Texas and a dog from neighboring Lea County, New Mexico. The small dog, which the USDA initially reported as a Texas case, lives in New Mexico and was reclassified as the first in that state.

The dog had not traveled to Mexico or Texas, so authorities were investigating around the property where the pet lived. If they find infected flies, animal inspections in the area will increase, New Mexico State Veterinarian Samantha Holeck said during a virtual news conference Monday."

What is the Risk to Humans?

No locally acquired human infestations have been reported in the United States, and the risk of infestation in people remains low. So while it sounds like the plot of a horror movie, it's primarily an animal agriculture concern right now.

Photo by Brandon Bell/Getty Images

Indiana Issues Animal Movement Restrictions

Although there are no local reported cases, to further contain any spread, the state of Indiana has issued restrictions for animal movement across state lines. They must be seen by an official USDA veterinarian and receive certificates of approval.

According to WishTV8, "The certificate of veterinary inspection must document the application of an effective treatment for New World screwworm. For livestock and poultry species, treatment must be applied within 14 days of movement, unless the animals are going directly to slaughter. Cats and dogs require treatment within five days of movement."

There are certain animals that are exempt from the new guidelines or have a different set of rules (animals of a particular species that are also housed inside). You can find more information about that if you click here.