This amazing bit from the wikipedia article about the fly:
"The first, and to-date largest, documented infestation of C. hominivorax myiasis outside of the Americas occurred in North Africa from 1989 to 1991. The outbreak was traced to a herd of sheep in Libya's Tripoli region, which began suffering screwworm attacks in July 1989; over the following months, the myiasis spread rapidly, infecting numerous herds across a 25,000 km2 area. Eventually, the infested region spanned from the Mediterranean coast to the Sahara Desert, threatening the more than 2.7 million animals susceptible to C. hominvorax that inhabited the area. More than 14,000 cases of large-scale myiasis due to the C. hominivorax species were documented. Traditional control methods using veterinary assessment and treatment of individual animals were insufficient to contain the widely dispersed outbreak, so the United Nations Food and Agriculture Organization launched a program based on the sterile insect technique.[10] About 1.26 billion sterile flies were produced in Mexico, shipped to the infested area, and released to mate with their wild counterparts. Within months, the C. hominvorax population collapsed; by April 1991, the program had succeeded in eradicating C. hominivorax in the Eastern Hemisphere. This effort, which cost under US$100 million, was among the most efficient and successful international animal health programs in UN history."
Incredible!
1. https://en.wikipedia.org/wiki/Cochliomyia