parasites
The U.S. confirms its first human case of New World screwworm. What is it?
U.S. officials confirmed a case of the flesh-eating parasite in a person who traveled from El Salvador. Screwworm typically affects cattle in South America, but has spread north in recent years.
Mexican ranchers struggle to adapt as a parasite ravages cattle exports to the U.S.
U.S. agriculture officials halted live cattle crossing the border in July due to concerns about the flesh-eating maggot which has been found in southern Mexico and is creeping north.
