A Maryland resident contracted New World screwworm, a parasitic fly, after traveling to El Salvador. This is the first U.S. case linked to a current outbreak. The person recovered, and no further transmission occurred. The screwworm, which lays eggs in open wounds, is rare in humans but poses a significant threat to livestock. The CDC and USDA are working to prevent further spread, particularly along the Texas-Mexico border, where the parasite is a concern for ranchers due to its potential to infest cattle. The parasite's larvae feed on flesh, causing painful sores; treatment involves surgical removal of the larvae.

Prepared by Olivia Bennett and reviewed by editorial team.