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new cases of screwworm in US

Texas rancher reacts to more New World screwworm cases

Jun 23, 2026 | 3:45 PM

The number of New World screwworm cases has risen to 15 in the southern United States with more animals testing positive in Texas over the weekend.  

New World screwworm is a parasitic fly whose larvae eats warm-blooded animals alive and can infect livestock, pets, and wildlife. The larvae burrow into living tissue of animals and cause severe wounds that can become fatal.  

The news is not totally bleak, according to Texas rancher John Malazzo, who knows the owners of one of the infected calves.  

“I talked to the owner yesterday and that calf is totally healthy and recovered and has been turned back out,” Malazzo said. “So this is not a, if you get a screwworm case, it doesn’t mean it’s a mortal situation. You can treat them and they will recover.” 

Malazzo said the key is to monitor cattle on a regular basis concentrating on wounds and navels. 

“To be able to do that, you’ve got to be able to see them. Some people back in South Texas, they’re in brush country, you don’t see your cattle very often. So, that is an issue. Here where we are in the Brazos Valley, we can pretty much look at every cow every day if we want to,” he said. 

The US Department of Agriculture said it will continue aggressive eradication efforts in affected areas, including the dispersal of tens of millions of sterile flies to interfere with screwworm reproduction. 

alice.mcfarlane@pattisonmedia.com

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