The New World screwworm, a parasitic fly, has started appearing again in the United States. More than 70 animal cases have been confirmed since June. Previously, the pest was nearly eradicated.
On Wednesday, Arizona reported its first case. This involved a dog in Cochise County, near the Mexican border.
The U.S. Department of Agriculture (USDA) and Arizona officials identified screwworm larvae in a wound. State Veterinarian Ryan Wolker mentioned that they had anticipated this situation and were prepared to act quickly.
The USDA has noted the dangers of screwworm. The larvae burrow into the flesh of living animals, creating significant wounds. In June, cases were also reported in Texas and New Mexico. Recently, the first wildlife case was documented.
Human infection remains very rare. The Centers for Disease Control and Prevention assure that the risk is low.
The U.S. has resumed some cattle imports from Mexico. These imports had stopped in late 2024 due to a confirmed screwworm case.
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