Flesh-eating screwworm infection detected in South Texas, USDA says
Summary
A possible case of the flesh-eating New World screwworm has been reported in South Texas, with tests sent to a national lab for confirmation. The screwworm parasite threatens livestock by laying eggs in wounds, causing serious infections. Authorities are working to verify the case and respond quickly if confirmed.Key Facts
- A sample of a possible screwworm infection is being tested at the USDA’s National Veterinary Services Laboratories in Iowa.
- The screwworm has not been detected inside the U.S. since it was eradicated in the 1960s using sterile insect techniques.
- The parasite has been moving north through Central America and was recently found in animals in Mexico close to the Texas border.
- Female screwworm flies lay eggs in wounds of warm-blooded animals; larvae feed on the living flesh, causing dangerous wounds.
- USDA officials are working on the ground and with local partners to monitor the situation.
- Some claims of screwworm cases just inside Texas have been denied by USDA, but testing of samples from Texas calves is ongoing.
- The screwworm’s return would pose a serious risk to U.S. cattle and livestock industries, which avoid major losses thanks to the previous eradication.
- The primary method to control screwworm populations involves releasing sterile male flies to prevent reproduction.
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