The New World screwworm has returned to the U.S. Now what?
It could take more than a year to eradicate the parasite again, experts warn
On a ranch near La Pryor, Texas, a sterile fly dispersal station from the U.S. Department of Agriculture is strategically placed near cattle. The release of sterile males is one way officials are trying to combat the spread of New World screwworm.
Eric Gay/AP Photo