Missouri Response to New World Screwworm Detection in US
The United States Department of Agriculture Animal and Plant Health Inspection Service (USDA-APHIS) has confirmed the presence of New World Screwworm (NWS) in the United States. On June 3, 2026, USDA confirmed NWS in a 3-week-old calf in Zavala County, Texas.
NWS is a serious pest that affects livestock, pets, wildlife and less commonly, people and birds. NWS larvae burrow into the flesh of living animals, causing serious damage to livestock and economic losses to producers.
The Texas case is the first detection of NWS in the U.S...
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