Cases of flesh-eating screwworm on the rise in Mexico
Published: 8/28/2025

Cases of flesh-eating screwworm on the rise in Mexico, with a 53% increase in infestations reported by government data. Animals like cattle, dogs, horses, and humans are affected by the New World screwworm parasite, causing serious health issues if left untreated. Recent cases have been seen in southern Mexican states, while US authorities confirmed the first human case in someone returning from El Salvador. The parasite, once eradicated in the US and Mexico, has resurfaced in tropical and subtropical regions, posing a risk for those with pre-existing health conditions.