Please see California Department of Food and Agriculture notice regarding the confirmation of New World Screwworm in Texas. Below is an excerpt from their notice:
SACRAMENTO, CA — June 4, 2026: The California Department of Food & Agriculture (CDFA) Animal Health Branch is issuing this notification to California livestock producers and veterinarians in response to a confirmed detection of New World Screwworm (Cochliomyia hominivorax, NWS) in the United States.
On June 3, 2026, the United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) confirmed the presence of NWS in Zavala County, Texas. The affected animal is a 3-week-old calf and larvae were identified in its umbilical area. This is the first confirmed detection of NWS in animals in the continental United States since the parasite was eradicated from the U.S.
SITUATION STATUS
At this time, there are NO confirmed detections of New World Screwworm in California. CDFA is coordinating closely with USDA APHIS and neighboring state animal health officials to monitor the situation. All California dairies and livestock operations are encouraged to maintain vigilance.
