New World Screwworm in Texas: Case Tracker & Map

Confirmed cases by county

Hover a county for detail. USDA reports 12 affected counties; the 9 individually named in reporting are shown here. USDA does not publish exact per-county totals, so the map shows status, not case numbers.

How the outbreak has grown

From the first U.S. case in ~60 years to today.

Outbreak timeline

1. Jul 10, 2026Confirmed case31 TX cases

   Outbreak reaches 32 cases across 12 Texas counties

   USDA confirmed 32 infestations total (31 in Texas, 1 in New Mexico) spanning 12 Texas counties across 23 premises. Crockett County has emerged as the epicenter, reported to lead the state with about eight cases.

2. Jul 4, 2026Confirmed case30 TX cases

   Cases climb to 31; spread to Crockett County

   USDA confirmed 31 infestations total (30 in Texas, 1 in New Mexico) — the latest two sheep in Crockett County, ~300 miles southwest of Dallas.

3. Jun 29, 2026Milestone25 TX cases

   US and Mexico open Metapa, Chiapas sterile-fly plant

   The $50M+ facility will produce up to 100M sterile flies weekly for the cross-border fight.

4. Jun 27, 2026Confirmed case25 TX cases

   Cases rise to 25; ground-vehicle fly releases begin

   USDA began its first ground-vehicle sterile fly releases amid 8,000+ traps and 59,000+ samples.

5. Jun 22, 2026Policy12 TX cases

   USDA commits $105M to 40 Grand Challenge projects

   Funding from 226 proposals included Texas A&M electron-beam sterilization research.

6. Jun 21, 2026Policy12 TX cases

   Abbott disaster declaration covers all 254 counties

   Texas launched screwworm.texas.gov as the FAO and IAEA opened a five-year sterile-insect project spanning 20+ countries.

7. Jun 18, 2026Policy11 TX cases

   Texas secures federal funding for 15 more inspectors

   A USDA cooperative agreement funded 15 new TAHC positions as 13 counties sat under quarantine.

8. Jun 16, 2026Confirmed case11 TX cases

   Spread reaches ~200 miles to Sutton and Tom Green

   USDA confirmed at least 12 cases (mostly cattle, plus goats and a dog) spanning ~200 miles from the initial Zavala site.

9. Jun 13, 2026Policy

   Abbott launches free NWS inspector training

   A free four-hour AgriLife Learn certification course opened to expand the pool of trained inspectors.

10. Jun 13, 2026Confirmed case11 TX cases

    San Angelo / Tom Green declare disaster; 11 cases

    A bovine case near Grape Creek brought the outbreak to 11 cases; quarantine grew to 12 counties.

11. Jun 8, 2026Policy6 TX cases

    Abbott activates State EOC; six cases, 10-county zone

    With new detections in La Salle, Gillespie and Edwards counties, Gov. Abbott raised the State Emergency Operations Center to Level II.

12. Jun 3, 2026Confirmed case1 TX case

    First U.S. case in 60 years — Zavala County

    USDA confirmed NWS in a three-week-old calf near La Pryor — the first U.S. case since eradication in the 1960s. TAHC established an infested zone.

13. May 30, 2026Approach31 mi from border

    Within 31 miles of Texas; CBP launches border campaign

    The closest approach — 31 miles — prompted a bilingual CBP awareness campaign across Laredo-area ports of entry.

14. May 29, 2026Milestone

    USDA opens Knipling-Bushland research lab in Kerrville

    A new 52,000-sq-ft federal livestock-insects lab opened in Kerrville as Mexico reported cases climbing in Nuevo León and Coahuila.

15. May 27, 2026Approach57 mi from border

    Closest yet — 57 miles, found in a domestic cat

    A confirmation in a 16-month-old cat put the pest 57 miles from the border as 100M sterile flies were released weekly.

16. May 15, 2026Policy

    Texas Senate convenes emergency hearing

    The Senate agriculture committee heard testimony from USDA, TPWD, Texas A&M and TAHC on the $750M Moore Air Base sterile-fly facility.

17. May 10, 2026Policy

    USDA extends sterile-fly releases to Eagle Pass

    Sterile fly operations expanded into Maverick County, shifting from reactive containment to a proactive barrier.

18. May 5, 2026Approach119 mi from border

    Jumps to a new Mexican state — Coahuila, 119 miles out

    A May 1 Coahuila detection marked a westward expansion; TDA expanded trapping with Swormlure.

19. Apr 30, 2026Policy60 mi from border

    FDA authorizes Negasunt Powder for emergency use

    The FDA issued an Emergency Use Authorization for a topical powder to prevent and treat infestations — its second screwworm EUA that week.

20. Apr 28, 2026Policy

    Florida restricts livestock from six Texas counties

    Florida required enhanced screening for animals from Zapata, Jim Hogg, Starr, Hidalgo, Webb and Brooks counties — before any U.S. case.

21. Apr 24, 2026Approach60 mi from border

    Advances to 60 miles; Miller activates emergency response

    A Nuevo León detection just 60 miles from the border — a 30-mile advance in two weeks — triggered state emergency protocols.

22. Apr 16, 2026Policy90 mi from border

    USDA APHIS releases updated Response Playbook

    APHIS published a revised playbook covering surveillance, spread reduction and business continuity.

23. Apr 14, 2026Approach90 mi from border

    Detected 90 miles from Texas in Nuevo León

    Texas Agriculture Commissioner Sid Miller warned of a detection ~90 miles south of the border — the northernmost to that point.

Frequently asked questions

Official sources

• USDA APHIS — NWS confirmed U.S. cases
• USDA APHIS — Stop Screwworm program
• Texas Animal Health Commission — NWS response
• Texas A&M AgriLife Extension — New World Screwworm
• State of Texas — screwworm.texas.gov
• FDA — Animal drugs for New World Screwworm

Case counts and county lists are compiled from our ongoing screwworm coverage, each article citing its primary sources. Figures reflect the most recent USDA APHIS total as of July 10, 2026 and are updated as new counts are published.