New World Screwworm in the US - What We Know So Far
The New World screwworm (NWS), a flesh-eating parasitic fly whose larvae feed on living tissue, has re-emerged as a major animal-health threat in the Americas after spreading northward through Central America and Mexico. On June 3, 2026, US authorities confirmed the first US case in decades in a calf in Texas.
On June 8, the US Department of Agriculture confirmed three additional cases of New World screwworm: two in Texas and one in New Mexico.
The Animal and Plant Health Inspection Service (APHIS) said the Texas cases involved a calf in...
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