Sioux Falls, SD, October 29, 2026 —

Arizona has recorded its first confirmed case of the New World screwworm, a parasitic insect that affects warm-blooded animals. The discovery was made in a domestic dog located in Cochise County, marking the first instance of this pest in the state.

The New World screwworm (Cochliomyia hominivorax) is a fly whose larvae feed on living flesh, typically entering wounds on animals. If left untreated, infestations can be severe and potentially fatal for the host animal. The U.S. Department of Agriculture (USDA) and state agricultural departments monitor for this pest due to its potential to impact livestock and wildlife.

Details regarding the specific circumstances of the dog’s infection, including when the case was identified or reported, have not been provided. Furthermore, information about any containment measures being implemented or the origin of the infestation was not detailed in the initial report.

Cochise County is situated in southeastern Arizona, bordering Mexico. The detection of the New World screwworm in this region raises concerns about potential spread. Federal and state animal health officials typically work to contain outbreaks to prevent wider dissemination among animal populations.

The New World screwworm was eradicated from the United States in 1966 through a sterile insect technique program, but sporadic reintroductions from Mexico have occurred over the decades. These reintroductions often prompt rapid response from animal health authorities to mitigate any potential spread.

The specific veterinary or public health actions being taken in response to this discovery in Cochise County were not specified. Officials emphasize the importance of vigilance for animal owners in areas where screwworm is detected.



Story summarized from the original created by Suryatapa Chakraborty on thehill.com, see more information here.

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