New World screwworm (NWS, Cochliomyia hominivorax) is a devastating pest. When NWS fly larvae (maggots) burrow into the flesh of a living animal, they cause serious, often deadly damage to the animal. NWS can infest livestock, pets, wildlife, occasionally birds, and in rare cases, people.
NWS is endemic in Cuba, Haiti, the Dominican Republic, and countries in South America. For decades, the United States and Panama have collaborated through the Commission for the Eradication and Prevention of Screwworm (COPEG) to prevent the pest’s northward movement. We use a biological control technique (sterilized insects) to eradicate NWS fly populations. This approach eradicated NWS from the United States in 1966 and eliminated a small outbreak from the Florida Keys in 2017.
Keeping NWS out of the United States is crucial to protect our livestock industry, economy, and food supply chain.
More information on the Animal and Plant Health Inspection Service website.
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