Overview

• The CDC and Maryland health officials confirmed the diagnosis on Aug. 4 via telediagnosis after the patient returned from El Salvador, according to HHS.
• No animal infections have been confirmed in the United States in 2025, though the parasite remains a serious threat to livestock.
• Industry communications previously cited Guatemala as the traveler’s origin, a discrepancy HHS has not clarified.
• USDA has announced a new sterile-fly production facility in Texas and expanded surveillance to keep the pest from establishing in U.S. herds.
• HHS has enabled emergency authorizations for animal drugs, and border livestock trade has faced suspensions as Mexico reports cases tied to the northward spread since 2023.