US sees 29 cases of New World screwworm in June

The latest case was reported in a dog in Pecos County, Texas, on June 30.

Ann Reus
July 1, 2026
Three cattle eating hay from a feed trough in a farm enclosure with metal railings
Andre Nery | BigStock.com

As of the end of June, there have been 29 cases of New World screwworm (NWS) in the U.S., according to the U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS).

The first case of NWS in the U.S. in more than 60 years was confirmed June 4 in a three-week-old calf in Zavala County, Texas. The latest case was reported in a dog in Pecos County, Texas, on June 30. Aside from one case of NWS in a dog in New Mexico, all cases have occurred in Texas, in cattle, goats, sheep and dogs.

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