Officials from the United States Department of Agriculture confirmed the detection of the New World screwworm in a calf in Texas, marking the first instance of this parasite in U.S. livestock in decades. Containment measures are being put in place to prevent the parasite from establishing itself again in the country.
The New World screwworm, scientifically known as Cochilomyia hominivorax, poses a significant risk to livestock, particularly cattle. Larvae can cause serious tissue damage and increase the likelihood of secondary infections, which can be fatal. Although these maggots rarely affect humans, their impact on animal populations can lead to higher beef prices.
A successful eradication campaign in the 1960s, utilizing the Sterile Insect Technique, had previously eliminated the screwworm from the U.S. This method involved releasing sterile male flies to disrupt breeding. However, by 2023, signs indicated that the measures to keep the parasite at bay were faltering, prompting renewed concern among agricultural officials.