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Mexico - New World Screwworm (NWS) outbreak 2025-2026

Mexico - New world screwworm (Cochliomyia hominivorax) - Follow up report 23
...
REPORT DATE
2025/07/29
...
EPIDEMIOLOGICAL COMMENTS
All myiasis outbreaks identified in the State until June 30, 2025 have been officially closed. Outbreaks detected after that date will be included in the relevant six-monthly report. Likewise, control measures continue to be applied in the State as well as epidemiological surveillance at national level, in accordance with the established guidelines.
...
UPDATED OUTBREAKS
ob_161302 - Campeche
ob_161296 - Candelaria
ob_161299 - Calakmul
ob_161300 - Escarcega
ob_161301 - Campeche
ob_161290 - Champoton
ob_161292 - Carmen
ob_161294 - Calakmul
ob_161297 - Candelaria
ob_161291 - Champoton
ob_161206 - Escarcega
ob_161293 - Holpechen
ob_161295 - Carmen
ob_161205 - Candelaria
ob_161298 - Candelaria
...
https://wahis.woah.org/#/in-review/6113
----------------------------------------------------------
Mexico - New world screwworm (Cochliomyia hominivorax) - Follow up report 11
...
REPORT DATE
2025/07/29
...
EPIDEMIOLOGICAL COMMENTS
All myiasis outbreaks identified in the State until June 30, 2025 have been officially closed. Outbreaks detected after that date will be included in the relevant six-monthly report. Likewise, control measures continue to be applied in the State as well as epidemiological surveillance at national level, in accordance with the established guidelines.
...
UPDATED OUTBREAKS
ob_161155 - Santiago Niltepec
ob_161157 - Heróica Ciudad de Juchitan de Zaragoza
ob_161152 - Heróica Ciudad de Juchitan de Zaragoza
ob_161158 - San Felipe Jalapa de Díaz
ob_161149 - San Miguel Chimalapa
ob_161148 - Asunción Ixtaltepec
ob_161123 - Santa María Sola
ob_161103 - San Miguel Chimalapa
ob_161105 - Asunción Ixtaltepec
ob_161100 - San Pedro Tapanatepec
ob_161101 - San Pedro Tapanatepec
ob_161104 - Santa María Chimalapa
ob_161106 - Santa María Chimalapa
ob_161094 - Asunción Ixtaltepec
ob_161092 - Unión Hidalgo
ob_161097 - Santo Domingo Zanatepec
ob_161102 - San Pedro Tapanatepec
ob_161122 - Santa María Chimalapa
ob_160855 - San Miguel Chimalapa
ob_161095 - Loma Bonita
ob_161098 - San Pedro Tapanatepec
ob_161096 - San Pedro Tapanatepec
ob_160854 - San Miguel Chimalapa
ob_161099 - San Pedro Tapanatepec
ob_160853 - Santiago Niltepec
ob_160857 - San Juan Guichicovi
ob_160856 - Matías Romero Avendaño
ob_160858 - San Juan Guichicovi
ob_161153 - Santo Domingo Zanatepec
...
https://wahis.woah.org/#/in-review/6371
------------------------------------------------------------------
Mexico - New world screwworm (Cochliomyia hominivorax) - Follow up report 23
...
REPORT DATE
2025/07/29
...
EPIDEMIOLOGICAL COMMENTS
All myiasis outbreaks identified in the State until June 30, 2025 have been officially closed. Outbreaks detected after that date will be included in the relevant six-monthly report. Likewise, control measures continue to be applied in the State as well as epidemiological surveillance at national level, in accordance with the established guidelines.
...
UPDATED OUTBREAKS
ob_161341 - Huimanguillo
ob_161343 - Cardenas
ob_161342 - Cardenas
ob_161329 - Jalapa
ob_161339 - Tacotalpa
ob_161340 - Emiliano Zapata
ob_161322 - Tenosique
ob_161323 - Macuspana
ob_161325 - Emiliano Zapata
ob_161326 - Huimanguillo
ob_161327 - Huimanguillo
ob_161328 - Comalcalco
ob_161320 - Jalpa de Mendez
ob_161321 - Macuspana
ob_161324 - Emiliano Zapata
ob_161318 - Cardenas
ob_161319 - Huimanguillo
ob_161316 - Huimanguillo
ob_161317 - Tenosique
ob_161311 - Cardenas
ob_160770 - Cunduacan
ob_161312 - Huimanguillo
ob_161313 - Cardenas
ob_161308 - Huimanguillo
ob_160768 - Jalpa de Mendez
ob_160767 - Paraiso
ob_161309 - Huimanguillo
ob_161310 - Huimanguillo
ob_161314 - Huimanguillo
ob_161315 - Huimanguillo
ob_161332 - Balancan
...
https://wahis.woah.org/#/in-review/6269
--------------------------------------------------------------
Mexico - New world screwworm (Cochliomyia hominivorax) - Follow up report 18
...
REPORT DATE
2025/07/29
...
EPIDEMIOLOGICAL COMMENTS
All myiasis outbreaks identified in the state until June 30, 2025 have been officially closed. Outbreaks detected after that date will be included in the relevant six-monthly report. Likewise, control measures continue to be applied in the State and epidemiological surveillance at national level, in accordance with the established guidelines.
...
UPDATED OUTBREAKS
ob_161179 - Othon P. Blanco
ob_161182 - Othon P. Blanco
ob_161180 - Bacalar
ob_161184 - Othon P. Blanco
ob_161183 - Othon P. Blanco
ob_161185 - Othon P. Blanco
ob_161186 - Othon P. Blanco
ob_161187 - Othon P. Blanco
ob_161188 - Othon P. Blanco
ob_161173 - Othon P, Blanco
ob_161174 - Bacalar
ob_161175 - Bacalar
ob_160776 - Othon P. Blanco
ob_161177 - Othon P. Blanco
ob_161178 - Jose Maria Morelos
...

https://wahis.woah.org/#/in-review/6289
----------------------------------------------------------------
Mexico - New world screwworm (Cochliomyia hominivorax) - Follow up report 11
...
REPORT DATE
2025/07/29
...
EPIDEMIOLOGICAL COMMENTS
All myiasis outbreaks identified in the State until June 30, 2025 have been officially closed. Outbreaks detected after that date will be included in the relevant six-monthly report. Likewise, control measures continue to be applied in the State as well as epidemiological surveillance at national level, in accordance with the established guidelines.
...
UPDATED OUTBREAKS
ob_161202 - Tizimin
ob_161196 - Panaba
ob_161199 - Akil
ob_161200 - Tekas
ob_161201 - Tzucacab
ob_161198 - San Felipe
ob_161189 - Oxkutzcab
ob_161190 - Sucila
ob_161191 - Buctzotz
ob_161197 - Sucila
ob_161192 - Dzidzantun
ob_161193 - Mazcanu
ob_161194 - Tzucacab
ob_160788 - Cenotillo
ob_160789 - Espita
ob_160790 - Temozon
ob_160791 - Tekal de Venegas
ob_160786 - Mascanu
ob_160787 - Maxcanu
ob_160783 - Panaba
ob_160784 - Tzucacab
ob_160785 - Tzucacab
ob_160781 - Tzucacab
ob_161195 - Motul
...
https://wahis.woah.org/#/in-review/6319
-----------------------------------------------------------
Mexico - New world screwworm (Cochliomyia hominivorax) - Follow up report 10
...
REPORT DATE
2025/07/29
...
EPIDEMIOLOGICAL COMMENTS
All myiasis outbreaks identified in this State until June 30, 2025 have been officially closed. Outbreaks detected after that date will be included in the relevant six-monthly report. Likewise, control measures continue to be applied in this State as well as epidemiological surveillance at national level, in accordance with the established guidelines.
...
UPDATED OUTBREAKS
ob_161168 - Las Choapas
ob_161171 - Minatitlan
ob_161172 - Las Choapas
ob_161166 - Ixhuatlan de Madero
ob_161165 - Las Choapas
ob_161162 - Uxpanapa
...
https://wahis.woah.org/#/in-review/6468​
 
Images translated by Google

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  • Semana Epidemiológica 29
​
https://www.gob.mx/salud/documentos...istema-unico-de-informacion-387843?idiom=es​​
​
 
This article relates to the death of an 86-year-old woman in Campeche mentioned in the epidemiology report above.

Translation Google

Woman with screwworm infection dies from cancer complications

Health authorities are strengthening surveillance after confirming a death linked to screwworm larvae infection in Mexico.

AN / LP Editorial
July 30, 2025 10:53

The Mexican Ministry of Health confirmed the first human death related to an infection by the cattle screwworm (Cochliomyia hominivorax) in the state of Campeche.

The victim was an 86-year-old woman with a history of invasive squamous cell carcinoma and systemic arterial hypertension, the federal agency reported in a statement.

In May 2025, the patient presented a myiasis infection caused by larvae of this parasite , which was promptly attended to and treated.

She was subsequently referred for oncological evaluation and treatment , but died on July 21 due to complications arising from her cancer.

The screwworm is the larval form of a fly that lays its eggs in open wounds of animals and humans. The larvae feed on living tissue, causing pain, severe infections, and, in severe cases, death if not treated properly.

This plague had been eradicated in Mexico since 1991 but reappeared in 2023, mainly in southeastern states such as Chiapas and Campeche, where dozens of human cases and thousands in animals have been reported.

Health authorities have issued warnings to the population, especially in rural areas, about the importance of keeping wounds clean and seeking immediate medical attention at the first signs of myiasis to avoid serious complications.

The Ministry of Health stated in its statement that it continues its epidemiological surveillance, education, and control efforts to contain the spread of the screwworm and protect public health and the livestock sector.

https://aristeguinoticias.com/30072...or-cobra-su-primera-victima-humana-en-mexico/
 
Translation Google
We are strengthening inspections and control of livestock movement in Veracruz.

We increased from 30 to 400 screwworm traps in Veracruz

National Service of Health, Safety and Agrifood Quality | August 11, 2025
BlogInspVeracruz.jpg


The Secretary of Agriculture went to the Parallel Verification and Inspection Point 18, where he supervised, together with Senasica, the delivery of certificates, as well as the registration and monitoring of livestock.

The Ministry of Agriculture informed representatives of livestock organizations in Veracruz about the progress and priority actions taken against the cattle screwworm (GBW) in the state, including: increased health surveillance from 30 to 400 traps in the state, the addition of 150 additional inspectors, and the strengthening of Verification and Inspection Points.

The aim of this is to prevent the plague from spreading to the center and north of the country. Therefore, inspections have been strengthened on the movement of cattle from certified corrals of origin to destination, and the black market for earrings is being aggressively combated.

The work of my colleagues, who work 24/7 at the inspection points, is important to prevent the spread of GBG to other states in the country. My appreciation to each and every one of you for your commitment to the strategy promoted by the Government of Mexico,” commented Secretary Julio Berdegué on his X account.

He also visited the La Escondida ranch, which recently had cases of the cattle screwworm in a calf and a foal. "Both animals are fine. The ranch is not quarantined nor removed from the SINIIGA (National Agricultural Research Institute) or the livestock registry. Don't pay attention to false information," said Berdegué Sacristán.

https://www.gob.mx/senasica/es/arti...e-movilizacion-de-ganado-en-veracruz?idiom=es

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Yucatán
/https://en.wikipedia.org/wiki/Yucat%C3%A1n
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https://www.instagram.com/p/DNKAXgnvpSW/?img_index=1


Translation Google

WENAETMTENTO MATA
YUCATAN
GOVERNMENT GEL EITAGD | 2024-2010

DGCS
CENERAL DIRECTORATE OF
UNITIES

Mérida, Yucatan, August 9, 2025
Communication number: 25-981

EFFECTIVE ATTENTION GUARANTEED FOR CASES OF SCREWWORM IN YUCATAN

. THE SECRETARIAT OF RURAL DEVELOPMENT, IN COORDINATION WITH SENASICA, MAINTAINS SURVEILLANCE AND IMMEDIATE RESPONSE TO ADDRESS REPORTS OF SCREWWORM IN ANIMALS IN YUCATAN, GUARANTEEING TREATMENT WITHOUT SLAUGHTER OR QUARANTINE.

The Ministry of Rural Development (Seder) reported 82 new cases of cattle screwworm in Yucatán, bringing the total to 212 confirmed cases, all of which have been cured.

Tzucacab, Tekal de Venegas, Teya, Izamal, Huhi, Maxcanu, Dzilam Gonzalez, Cenotillo, and Mérida reported two cases in each municipality, in cattle, sheep, goats, and dogs, ranging in age from six days old to six years old. These animals presented wounds mainly from barbed wire and bat bites on body parts such as the cervical region, head, udder, thigh, vulva, ear, hock, and navel.

Meanwhile, Calotmul, Temozón, Halachó, Peto, Buctzotz, Cansahcab, and Espita identified three cases each, in cattle, pigs, dogs, and horses between six days old and nine years old, injured by branding, goring, fighting, being tagged with a band, barbed wire, papillomatosis, and bat bites.

In Tekax, four cases were reported in cattle, whose ages ranged from 15 days old to eight years old; they presented injuries to the navel, horn, and vulva.

Tizimin documented nine cases in cattle, horses, and pigs, with injuries to the forearm, navel, interscapular region, cervical region, horn, and udder. Their ages ranged from eight days old to 20 years old.

Meanwhile, Panabá and Tunkás reported eight cases each, in cattle aged between five days old and seven years, with injuries to the navel, thorax, horn, vulva, and ear.

In the municipalities of Hocabá, Tixkokob, Muna, Ticul, Dzoncauich, Sucilá, Oxkutzcab, Opichén, Kopomá, Chapab, Baca, Cantamayec, Xocchel, and Kantunil, there was one case each, in dogs, sheep, pigs, and cattle aged five days old to 10 years, with injuries to the navel and udder.

The cases by species are distributed as follows: 176 cattle, 14 dogs, 4 horses, 5 sheep, 11 pigs, and two goats.

The Department of Agriculture (SEDER) and the National Service for Agrifood Health, Safety, and Quality (Senasica) are working together to effectively address citizen reports of the presence of the pest in animals of different species.

Cale 52 nun.458x 51, Centro, Zip Code 97000 Mérida, Yucatán, Mexico. 1959) 524 11 45
yucatan.gob.mx​
 
Translation Google

First person infected with screwworm detected in Yucatán

Published August 22, 2025​


The State Government, through the Yucatán Ministry of Health (SSY), reports that a case of screwworm myiasis (Cochliomyia hominivorax) was confirmed today in a resident of the municipality of Izamal, originally from the state of Tabasco.

The patient was recently treated at the Regional Hospital of High Specialty of the Yucatán Peninsula (HRAEPY), where he received timely and specialized care, which led to his favorable evolution and medical discharge on August 11. He currently remains under outpatient monitoring by Health Jurisdiction No. 1.

The detection was made thanks to the coordinated work of the SSY's Directorate of Health Prevention and Protection and the Department of Epidemiological Surveillance, which immediately implemented prevention and control actions in the area, in coordination with local health authorities and with the support of the National Service of Health, Safety and Agri-Food Quality (SENASICA), with the aim of safeguarding public health.

The state agency recommends that the population keep wounds clean and covered with dry, secure dressings, practice proper hygiene by washing with sterile solutions, avoid the accumulation of garbage and organic waste that may attract insects, periodically check domestic and farm animals for injuries, and use physical barriers such as mosquito nets and repellents to reduce contact with insects.

It also urges people to immediately go to the nearest health center at any sign of infection.

The administration led by Governor Joaquín Díaz Mena reiterates its commitment to protecting the health of the population and will continue to strengthen surveillance, prevention, and timely response efforts to ensure the well-being of Yucatecan families.

​https://salud.yucatan.gob.mx/noticia/ver/232
 
Translation Google​

Screwworm "jumps" to more species; found in cats and birds

The screwworm in Mexico that is keeping the U.S. border closed to livestock has already infected new species, including dogs and cats , in addition to the first case in a red-breasted hawk .

By: Editorial Staff August 24, 2025 07 37

As of August 10, 4,735 cases of screwworm have been detected in animals in the country, of which 633 are still active. Of the total, 80.36% were reported in cattle, 5.09% in horses, 4.18% in pigs, and the remainder in humans , dogs , cats , and birds .

This pest is present in the states of Chiapas, Tabasco, Oaxaca, Campeche, Yucatán, Quintana Roo, and Veracruz.

The veterinary zootechnician, Guillermo Manuel Ortega , from the National Autonomous University of Mexico (UNAM), revealed to El Universal that the first reported case in wildlife, in a red-breasted hawk , raises alarm bells, as it is the first protected species officially documented with this infection.

He warned that "the screwworm is no longer just a challenge for livestock farming, but also a potential threat to biodiversity . "

Carlos Lamothe, a veterinary zootechnician and livestock farmer in central Veracruz, explained that authorities failed to implement sanitary control measures or individual monitoring of wildlife, which could lead to a silent spread of the plague.

He also noted that in addition to containing the plague in Mexico, they must also prevent it from re-entering Mexico from another country, as happened last November on the southern border.

https://puentelibre.mx/crealo/salta_gusano_barrenador_mas_especies_hallaron_gatos_aves_agosto_2025/
 
Mexico reports 53% increase in flesh-eating screwworm cases since July

By Heather Schlitz and Cassandra Garrison

August 27, 2025 6:18 PM CDT

Aug 27 (Reuters) - Mexico has recorded 5,086 cases of flesh-eating screwworm in animals as of August 17, a 53% jump from the number of cases reported in July, according to Mexican government data seen by Reuters on Wednesday.

The updated numbers, which have not been previously reported to the public, showed 649 currently active cases.

"That's absolutely concerning," said Neal Wilkins, CEO of conservation and cattle group East Foundation. "Having a 50% increase in month-over-month numbers, particularly in the extreme heat, means they haven't gotten it under control."
...

https://www.reuters.com/business/en...eating-screwworm-cases-since-july-2025-08-27/
 
Source: https://theyucatantimes.com/2025/09...three-elderly-women-including-one-in-yucatan/

Screwworm Outbreak in Mexico Claims Lives of Three Elderly Women, Including One in Yucatán
written by Yucatan Times September 16, 2025 0 comment
Screwworm (Photo: YAI)

Mexico is facing a troubling resurgence of screwworm disease, a parasitic infection caused by the larvae of the Cochliomyia hominivorax fly.

This aggressive parasite lays eggs in open wounds, and its larvae feed on living tissue, leading to severe infections known as myiasis. If untreated, the condition can be fatal—especially among vulnerable populations.

In September 2025, health authorities confirmed the deaths of three elderly women due to complications from screwworm infestations. One of the victims was a 86-year-old woman in Campeche, who had underlying health conditions including cancer. Another fatal case occurred in Chiapas, and the third was reported on the Yucatán Peninsula, where the woman succumbed to a rapidly progressing infection that had gone undetected for several days.

The outbreak has raised alarms across southeastern Mexico. In Yucatán alone, over 480 cases have been reported in animals, and three human infections have been confirmed, including one involving a 47-year-old man in Mérida. The disease has spread across 69 municipalities, prompting coordinated efforts by the Yucatán Ministry of Rural Development (Seder) and SENASICA, Mexico’s national food safety agency.​..
 
[emphasis is mine]

USDA Press Release

Mexico Confirms Case of New World Screwworm in Nuevo Leon


(Washington, D.C., September 21, 2025)– Hours ago, Mexico’s National Service of Agro-Alimentary Health, Safety, and Quality (SENASICA) confirmed a new case of New World screwworm (NWS) in Sabinas Hidalgo, located in the state of Nuevo León, less than 70 miles from the U.S.-Mexico border.

This is now the northernmost detection of NWS during this outbreak, and the one most threatening to the American cattle and livestock industry. Sabinas Hidalgo is located near the major highway from Monterrey, Nuevo Leon, to Laredo, Texas, which is one of the most heavily trafficked commercial thoroughfares in the world.

"Protecting the United States from NWS is non-negotiable and a top priority of the Trump Administration,” said U.S. Secretary of Agriculture Brooke L. Rollins. “This is a national security priority. We have given Mexico every opportunity and every resource necessary to counter NWS since announcing the NWS Bold Plan in June 2025. Nevertheless, American ranchers and families should know that we will not rely on Mexico to defend our industry, our food supply, or our way of life. We are firmly executing our five-pronged plan and will take decisive action to protect our borders, even in the absence of cooperation. Furthermore, we will pursue aggressive measures against anyone who harms American livestock.”

The previous northernmost detection was reported on July 9, 2025, in Veracruz, approximately 370 miles farther south. Preliminary reports from SENASICA indicate that the affected animal—an 8-month-old cow—had recently been moved to a certified feedlot in Nuevo León from a region in southern Mexico with known active NWS cases. The potential link to animal movement underscores the non-negotiable need for Mexico to fully implement and comply with the U.S.–Mexico Joint Action Plan for NWS in Mexico.

Currently, U.S. ports remain closed to imports of cattle, bison, and horses from Mexico.

Since July, USDA alongside Mexico, has been actively monitoring nearly 8,000 traps across Texas, Arizona, and New Mexico. To date, more than 13,000 screening samples have been submitted, with no NWS flies detected. USDA is analyzing all new information related to the recent case in Nuevo León and will pursue all options to release sterile flies in this region as necessary.

In addition, USDA will soon release a significant plan to help rebuild the American cattle supply, incentivizing our great ranchers, and driving a full-scale revitalization of the American beef industry. This is only the beginning with many more announcements coming this week as USDA restores American strength, protects food security, and supports America’s ranchers and farmers.

USDA Leads An Aggressive National Response

Under the decisive leadership of Secretary Rollins, USDA has made substantial progress in implementing its sweeping, five-prong plan to protect the nation’s livestock, wildlife, and public health from the growing threat of NWS. This effort reflects the Trump administration’s unwavering commitment to safeguarding America’s agricultural economy and food security through a unified, whole-of-government response.

USDA serves as the lead coordinating agency, deploying advanced surveillance systems; ramping up domestic preparedness; investing in innovative detection, control, and response tools and strategies; and supporting robust cross-border response efforts in Mexico and Central America to combat the pest and push it away from the United States. USDA’s comprehensive strategy includes the following immediate actions:

1. Innovating Our Way to Eradication
  • USDA is investing $100 million in breakthrough technologies through the NWS Grand Challenge, which will solicit ideas to enhance sterile fly production and develop new tools such as advanced traps, lures, and therapeutics.
  • USDA is also exploring and validating technologies like e-beam and x-ray sterilization, genetically engineered flies, and modular sterilization facilities through public listening sessions and ongoing evaluations.
2. Protecting the U.S. Border
  • USDA has begun construction on a domestic sterile fly dispersal facility at Moore Air Force Base in Edinburg, Texas. This $8.5 million facility, expected to be substantially complete by the end of 2025, will be capable of dispersing up to 100 million sterile flies per week.
  • Planning is also underway with the U.S. Army Corps of Engineers for construction of a domestic sterile fly production facility in Southern Texas, with a projected capacity of 300 million sterile flies per week.
3. Strengthening Surveillance and Detection
  • Since July, USDA alongside Mexico, has been actively monitoring nearly 8,000 traps across Texas, Arizona, and New Mexico. To date, more than 13,000 screening samples have been submitted, with no NWS flies detected.
  • USDA continues to disperse 100 million sterile flies per week in Mexico, sourced from the COPEG facility in Panama. USDA is providing support to Mexico to renovate a production facility in Metapa, which is expected to produce an additional 60–100 million sterile flies.
4. Enhancing Public Awareness and Education
  • APHIS has published an updated national disease response strategy and is providing training and webinars for federal, state, Tribal, and veterinary partners.
  • Outreach materials, including pest ID cards and alerts, are being distributed along the U.S.–Mexico border. APHIS has held over 50 stakeholder meetings and continues to expand outreach efforts.
5. Coordinating with Mexico and International Partners
  • Following detections in Oaxaca and Veracruz, USDA closed southern ports of entry to livestock trade after a case was reported 370 miles from the U.S. border.
  • USDA is conducting monthly audits of Mexico’s NWS response and is helping Mexico develop a more risk-based trapping plan, especially in Veracruz and along the border. Mexico currently deploys traps in high-risk areas, with USDA support.
  • USDA is supporting hiring of over 200 surge staff for trapping and animal movement control in Mexico.
  • SENASICA has launched a dashboard that tracks NWS cases across Mexico. This tool significantly enhances USDA’s ability to monitor the situation south of the border, better assess risk, and deliver more effective operational responses in coordination with Mexican authorities.
Unprecedented Interagency Collaboration

USDA is working in close partnership with the following federal agencies to ensure a unified national response.
  • Centers for Disease Control and Prevention (CDC) is leading human health surveillance and response, providing diagnostic support, educating healthcare providers, and coordinating One Health efforts across federal, state, and international partners.
  • Food and Drug Administration (FDA) is working to ensure veterinarians, farmers, and animal health officials have timely access to the tools they need to protect pets, livestock, and the nation’s food supply by authorizing the emergency use of certain animal drugs to treat or prevent infestations caused by the New World Screwworm (NWS). In addition, on August 19, FDA issued a declaration that enables Emergency Use Authorizations (EUAs) for animal drugs to treat or prevent infestations caused by the New World Screwworm (NWS).
  • Department of the Interior (DOI) is ensuring wildlife surveillance and environmental compliance, particularly on federal lands.
  • Department of Energy (DoE) is exploring and validating new sterilization technologies to enhance our ability to combat NWS.
  • Department of Homeland Security (DHS) is supporting surveillance, intelligence sharing, and emergency planning, including training Customs and Border Protection and Immigrations and Customs Enforcement personnel to identify and respond to NWS cases.
  • Environmental Protection Agency (EPA) is expediting pesticide approvals and supporting emergency exemptions.
  • Department of State (DoS) is leading diplomatic engagement to combat NWS by coordinating with host governments and interagency partners to share information, align technical assistance, and deliver consistent messaging.
This collaboration is guided by the U.S. One Health Coordination Unit for NWS (U.S. OHCU–NWS), co-led by USDA, CDC, and DOI. Together, these agencies are executing a phased response strategy that includes early detection, rapid containment, and long-term eradication efforts.

What You Can Do

NWS maggots can infest livestock and other warm-blooded animals, including people. They most often enter an animal through an open wound and feed on the animal’s living flesh.

USDA urges residents on the southern border to check their pets and livestock for signs of NWS. Look for draining or enlarging wounds and signs of discomfort. Also look for screwworm larvae (maggots) and eggs in or around body openings, such as the nose, ears, and genitalia or the navel of newborn animals. If you suspect your animal is infected with screwworm, contact your state animal health official or USDA area veterinarian immediately.

While not common in people, if you notice a suspicious lesion on your body or suspect you may have contracted screwworm, seek immediate medical attention.

Learn more about NWS on the APHIS website

​https://www.usda.gov/about-usda/new...-confirms-case-new-world-screwworm-nuevo-leon

​
 
Reuters - Updated 37 mins ago

Mexico sees 32% jump in flesh-eating screwworm cases since August as cases move north

Excerpt:
MEXICO CITY, Oct 1 (Reuters) - Mexico saw a nearly 32% increase in confirmed cases of the flesh-eating screwworm parasite, according to the latest monthly government data, as a concentration of cases moves north.
-snip-
The latest report by sanitation agency Senasica, which was published on September 26 and seen by Reuters on Wednesday, shows the outbreak is becoming more concentrated as it moves northward through Mexico.
Of the total cases, 5,258 were confirmed in cattle​

...https://www.reuters.com/business/he...-cases-september-cases-move-north-2025-10-01/


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Source: https://www.reuters.com/business/he...ewworm-case-northern-border-state-2025-10-06/

Mexico confirms new screwworm case in northern border state Nuevo Leon
By Cassandra Garrison
October 6, 20255:36 PM EDTUpdated 4 hours ago​

MEXICO CITY, Oct 6 (Reuters) - Mexico's agriculture ministry said on Monday another case of the flesh-eating screwworm parasite was detected in Nuevo Leon, which borders the United States, marking the state's second confirmed case in about two weeks...
 
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