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New World screwworm case tracker
Counts come from the USDA public dashboard. If a fetch fails, we show the last good snapshot. We never invent numbers.
If you see a wound with maggots
- Report it Call your state animal health official or your vet. USDA asks anyone who sees suspicious wounds, maggots, or infestations in animals to report them.
- Do not wait Screwworm larvae feed on living flesh. It can kill an animal if not treated.
- Keep checking Look at wounds, navels on newborns, and tag or brand sites during warm weather.
By month of confirmation
| Month confirmed | Domestic | Total | Active domestic | Inactive domestic |
|---|---|---|---|---|
| August 2026 | 4 | 4 | 0 | 4 |
| November 2026 | 3 | 3 | 2 | 1 |
| October 2026 | 35 | 40 | 31 | 4 |
| September 2026 | 3 | 4 | 0 | 3 |
Source: USDA Tableau summary CSV. USDA page dated Nov 2, 2026. We checked Nov 3, 2026.
Southern border ports
- Douglas, AZ: Aug 24, 2026
- Santa Teresa, NM: Sep 24, 2026
- Columbus, NM: Oct 26, 2026
- Nogales, AZ: Nov 30, 2026
From the USDA current status page. Confirm details on usda.gov before you move animals.
Recent USDA notes
- 10/28/26 USDA Confirms New World Screwworm in Arizona 10/23/26 Texas Modifies New World Screwworm Infested Zone 10/21/26 USDA Confirms First Detection of New World Screw
State pages with verified sources
Other states: state animal health officials list.