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TOPHAND News Service / Screwworm Watch

Texas Screwworm Watch

Check updates, the Texas map, reporting links, and who to call.

Photo review is coming soon. Report suspected cases to officials and call a veterinarian now.
Closeup of an adult New World screwworm fly with orange eyes and metallic body
USDA photo reference: orange eyes, metallic blue-green body, dark dorsal stripes.
Owner outreachKnow, check, reportMake official guidance easy to scan before a suspicious wound becomes a delay.
Surveillance supportCounty-aware alertsConnect zone changes, home-county distance, reports, photos, and official links.
Computer visionComing soonPhoto uploads are hidden until the VLM review stack is ready for public intake.
Texas Zone Map

Keep the live TAHC map one tap from the field.

TAHC's live web map is the fast geography check for Texas users. Use it to review current zone context, then confirm movement, reporting, and animal-health decisions with official guidance.

Infested
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Adjacent
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TAHC layer update
Checking source
TAHC New World Screwworm ZonesDaily Texas county tile from the public TAHC zone layer.

GPS can fill your home county.

Square Texas zone tile showing TAHC New World screwworm infested and adjacent surveillance zones over county boundaries
Nearest infested zoneSelect county
County alertsGet notified when confirmed infestations change your home-county distance.

Sign in for confirmed infestation and distance updates.

Current Briefing

What changed, why it matters, and where to verify it.

A launch feed of cited updates. The awareness desk is designed to bring together government alerts, extension guidance, farm press, local news, broadcast clips, and field reports in one readable place.

June 13, 2026

Case-count stories and pet-treatment news are driving public attention

TopHand's public news scan found strong attention around U.S. case-count updates, local coverage of additional Texas cases, and FDA's emergency authorization for a pet treatment option.

Source: TopHand news scan
June 11, 2026FDA / USDA APHIS

Emergency authorization issued for nitenpyram treatment in dogs and cats

FDA issued an EUA for generic nitenpyram tablets to treat New World screwworm myiasis in dogs, puppies, cats, and kittens meeting age and weight criteria. USDA framed most U.S. pets as low risk unless they were recently in confirmed-case areas.

Read source
June 12, 2026USDA APHIS / Screwworm.gov

Official status page updated with reporting guidance and current response links

USDA's current-status hub points the public to confirmed detection dashboards, reporting resources, trade restrictions, and sterile-insect response updates. It says suspicious wounds, maggots, or infestations should be reported immediately.

Read source
June 9, 2026USDA APHIS

USDA reported a sixth U.S. case and emphasized early detection

APHIS confirmed a La Salle County calf case and described joint state-federal response work: case tracing, surveillance, testing, trapping, sterile insect release adjustments, and outreach. USDA also stated that the U.S. food supply remains safe.

Read source
June 8, 2026Texas Department of Agriculture

Sid Miller renewed calls for immediate SWASS deployment

Commissioner Sid Miller argued that sterile flies should be paired with the Screwworm Adult Suppression System. His warning line for producers was blunt: "Every day we delay" gives the pest room to spread.

Read source
June 4, 2026CDC

CDC situation summary: low human risk in the U.S., but painful infestations need care

CDC reported no locally acquired human infestations in the United States, while noting the outbreak has moved north through Central America and Mexico since 2023 and can affect animals and people.

Read source
June 3, 2026USDA APHIS

USDA confirmed New World screwworm in a Texas calf

APHIS confirmed the first animal case of the current U.S. outbreak in Zavala County, Texas and described immediate containment steps including a 20 km infested zone, movement controls, surveillance, and sterile-fly release.

Read source
Response Debate

Sterile flies, SWASS, surveillance, and the urgency argument.

Sterile insect technique

The proven backbone: release sterile males so females lay nonviable eggs. USDA says current investments aim to approach historical production levels used during eradication.

Cited detail

SWASS and bait systems

Miller is pressing for SWASS as a bridge tool to kill fertile adult flies while sterile-fly capacity ramps. USDA and other experts continue weighing modern bait, lure, and environmental constraints.

Cited detail

Texas production capacity

APHIS lists Pacora, Metapa, and Moore Air Base as production or dispersal nodes. Moore Air Base is listed as an operational dispersal facility and a future domestic production site.

Cited detail
Ranch Readiness

Reduce the odds of the open wound before the fly ever arrives.

Screwworm awareness should not only be a reporting page. The practical ranch response is a daily loop: inspect animals, reduce fly pressure, prevent wounds, document concerns, and know exactly who to call before a suspicious case appears.

Daily wound scan

Inspect wounds, navels, ears, nose, genital area, and other openings. Watch for irritated behavior, drainage, foul odor, or visible larvae.

APHIS signs and reporting

External parasite pressure plan

Treat fly and tick pressure as a wound-prevention issue. Texas A&M AgriLife recommends discussing sprays, pour-ons, dips, ear tags, and pasture monitoring with your veterinarian.

Texas A&M AgriLife preparedness

High-risk procedure calendar

Plan extra observation around calving, shearing, branding, castration, dehorning, tagging, transport, predator injuries, and any procedure that leaves an open wound.

CDC exposure basics

Isolation and reporting drill

If a case is suspected, separate affected animals when practical, call a veterinarian, notify animal-health officials, and avoid moving animals until directed.

AgriLife legal update

Facility edge audit

Walk chutes, alleys, pens, trailers, gates, latches, mineral feeders, and water points. Mark anything that could puncture, scrape, pinch, or tear skin.

TopHand prevention workflow

Photo and record loop

Keep dated photos of wounds, facilities, and repairs. Clear records speed up veterinary conversations, official reporting, and follow-up checks.

USDA report suspected cases
Wound-Prevention Map

Places to inspect before high-risk handling days.

Chutes and squeeze areas

Look for rough welds, pressure points, broken rubber, head-catch rub spots, protruding pins, and places animals hit when backing or lunging.

Pens, alleys, and crowd tubs

Inspect tight turns, splintered boards, pipe ends, manure slicks, exposed wire, and corners where animals pile up or scrape shoulders and hips.

Trailers and ramps

Check ramp cleats, floor rot, gate gaps, sharp thresholds, divider hardware, and places animals can catch legs or tear hide during loading.

Fences, gates, and latches

Find loose panels, wire tails, bent T-post clips, old barbed wire, hinge pinch points, nail heads, and latch hardware at animal height.

Water, feed, and mineral sites

Look at rub edges, loose tin, broken troughs, hay-ring burrs, feeder bolts, and muddy footing where cattle crowd daily.

Pasture objects and debris

Remove junk iron, low limbs, broken equipment, scrap wire, old panels, and storm debris before they become wound sources.

What To Look For

Visual field cues for owners, veterinarians, and first calls.

USDA says the most important thing animal owners can do is know what to look for and how to report suspected cases. Use these cards as a quick second-look guide, then contact a veterinarian, state animal health official, or USDA if a case is suspicious.

Reference photo showing New World screwworm signs around a woundActual reference photo

Draining or enlarging wounds

Treat a wound that is getting wider, deeper, wetter, swollen, bloody, painful, or foul-smelling as an urgent second-look case.

  • Drainage or bleeding
  • Wound edges expanding
  • Foul odor with swelling or pain
USDA APHIS owner guidance
Odor CuePair smell with visible wound changes.
Putrid smell
Drainage
Swelling or pain
Field-cue illustration

Foul odor or decay smell

Smell alone does not diagnose screwworm, but a putrid odor with drainage, swelling, pain, or visible larvae should raise urgency.

  • Putrid or decaying smell
  • Bloody discharge
  • Odor plus swelling or pain
CDC clinical overview
Reference photo of mature New World screwworm larvaeActual reference photo

Maggots or egg masses

Look for eggs or larvae in wounds and around moist tissue. Maggots feeding in living tissue are the concern that needs immediate reporting.

  • Creamy egg masses near wound edges
  • Visible larvae or maggots
  • Movement inside living tissue
USDA APHIS field brochure
High-Risk SitesCheck moist openings and newborn navels.
NoseEarsGenital areaNewborn navel
Lesions, drainage, odor, or movement near these sites should trigger a call.
Body-site illustration

Lesions in body openings

Check nose, ears, genital areas, the umbilical area of newborn animals, and other moist openings where lesions can be easy to miss.

  • Nose, ears, or genital area
  • Umbilical area on newborns
  • Lesion, drainage, or odor near an opening
USDA APHIS owner guidance
Behavior ChangeLook at the animal and the wound together.
Discomfort plus a suspicious wound should move the case up the urgency list.
Behavior cue illustration

Signs of discomfort

Behavior does not diagnose screwworm, but discomfort plus a suspicious wound should trigger a closer inspection and a call for help.

  • Irritated or restless behavior
  • Depression or not eating
  • Isolation from other animals or people
USDA APHIS owner guidance
Suspect a case?Call a veterinarian, state animal health official, or USDA immediately. Though rare in people, anyone with a suspicious lesion should seek immediate medical care.Report suspected cases
Eradication History

Decades ago, the breakthrough was biological: stop reproduction.

The sterile insect technique worked because female New World screwworm flies mate once. If enough sterile males mate with wild females, eggs fail to hatch and the population collapses generation by generation.

1930s

Species clarity and mass-rearing breakthroughs

USDA researchers established the New World screwworm as distinct from blowflies that feed on dead matter, then developed ways to rear large numbers for research.

Verify
1950s

Sterile insect theory moved into field trials

Edward Knipling's idea was simple and powerful: overwhelm wild populations with sterile males so reproduction fails over successive generations.

Verify
1966

United States eradication

APHIS states that sterile insect technique eradicated New World screwworm from the United States in 1966.

Verify
2017

Florida Keys outbreak eliminated

APHIS cites sterile insect technique as the method that also helped eliminate the small Florida Keys outbreak in 2017.

Verify
2026

The playbook is back in public view

Current response combines detection, reporting, quarantines or movement controls, sterile insects, facility expansion, and public awareness.

Verify
Computer Vision Review - Coming Soon

Photo analysis is being prepared before public intake.

The public launch focuses on awareness, official reporting pathways, zone-map access, and readiness guidance. Uploads will open after provider routing, safety language, storage, and review prompts are ready.

Wound Photo ReviewComing soon

We are preparing the computer-vision wound review before public intake. For now, use the visual guidance on this page and report suspected cases through official channels immediately.

Public upload intake disabledReview prompts and provider routing in progressOfficial reporting links remain available now
Facility Photo Audit - Coming Soon

Facility image review is part of the next public phase.

The checklist and wound-prevention map are live now. Photo-based facility risk review will stay hidden until the model workflow is ready for public use.

Facility Photo AuditComing soon

We are preparing the computer-vision facility review before public intake. For now, use the readiness checklist and inspect handling areas directly before high-risk work.

Public upload intake disabledReview prompts and provider routing in progressOfficial reporting links remain available now
Public Tooling Roadmap

Make the method usable by ranchers, researchers, and builders.

Clear photo-review checklists

Publish plain-language checklists for wound photos, larvae signs, body-site context, and facility hazards so users know what the review is looking for.

Private photo records

Help users keep dated wound, animal, and repair photos organized without exposing producer identity or turning private reports into public posts.

Better second-look review

Prepare future photo review with more known examples, more negative examples, and clearer confidence ranges as the reference library grows.

Community alert desk

Bring official updates, local news, agriculture blogs, broadcasts, and field reports into one readable awareness feed.

Source Radar

Coverage lanes for a full TopHand intelligence feed.

Government

USDA APHIS, CDC, FDA, TDA, TAHC, state animal-health offices, COPEG, SENASICA, and disaster declarations.

Academic and extension

Texas A&M AgriLife, National Agricultural Library, veterinary manuals, entomology papers, and sterile-insect history.

News and blogs

Farm press, local Texas outlets, national coverage, agriculture blogs, newsletters, and producer association updates.

Broadcast and radio

YouTube, TV clips, radio interviews, podcasts, and transcripts reviewed for useful updates and quotes.

Field signals

Producer reports, submitted photos, county-level concern clusters, travel history, and official reporting redirects.

Editorial review

Every item needs a source URL, publish date, named people and places, confidence rating, quote handling, and a readable summary.

Visual References

Known images are useful, but they are not enough for a diagnosis.

These source-backed images help users learn visual cues while the computer-vision review workflow remains in preparation. They are educational references, not a diagnosis.

Adult New World screwworm fly reference photo
Adult flyPhoto by USDA via APHIS photo gallery
New World screwworm fly with egg mass on wound
Fly and egg massPhoto by USDA via Kentucky Fish & Wildlife
Mature New World screwworm larvae
Mature larvaePhoto by USDA via Kentucky Fish & Wildlife

Computer vision is coming soon

The first public version keeps the upload workflow closed while the VLM review, storage, and safety language are finished.

What comes next

Add recurring ingestion for APHIS, CDC, TDA, academic alerts, RSS, YouTube transcripts, radio transcripts, readiness articles, field reports, and public photo-review guidance.