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Deadly Screwworm Found in Arizona Dog
29 Oct
Summary
- New World screwworm detected in an Arizona dog, marking a first for the state.
- Parasitic fly cases are accelerating, with a significant increase in New Mexico.
- The USDA confirmed 71 screwworm cases in the US since the outbreak began.
New World screwworm has been detected in Arizona for the first time, identified in a dog in Cochise County. This marks a significant development as cases of the deadly parasite, whose larvae infest animal wounds, are accelerating across the United States.
Since the outbreak began, the US Department of Agriculture has confirmed a total of 71 screwworm cases. While early infections were primarily concentrated in Texas, the pace has increased this month, particularly in New Mexico, which now has 10 active cases. The discovery of screwworm in wildlife last week has heightened concerns for cattle ranchers.
The spread coincides with the reopening of ports in Arizona and New Mexico to cattle shipments from Mexico, following a halt initiated when the pest's resurgence was noted. The fly had previously been eradicated from the US but began spreading north again after the pandemic, reaching Mexico in late 2024.
While a major threat to livestock, screwworm can affect various animals, including goats, horses, and pets. The five most recent cases involved four dogs and one cat, underscoring its diverse host range.
