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

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Ciudad Juárez is a Mexican city on the Rio Grande, just south of El Paso, Texas
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Local
Monday, August 17, 2026

Senasica reports first active case of screwworm in Ciudad Juárez

Chihuahua has 82 active cases, while nationally there are 1,868.

Paola Romo

Ciudad Juárez now has an active case of cattle screwworm (GBG) . The most recent report from the National Service for Agrifood Health, Safety and Quality (Senasica) included the border municipality with one case, among the 82 active cases in Chihuahua.

The report of active GBG cases in Mexico, corresponding to August 14 and updated on August 17, 2026, places Juárez with one active case, along with other municipalities in the state.

This data places Ciudad Juárez on the map of municipalities with an active presence of this plague for the first time and acquires special relevance due to its border location with the United States and its proximity to ports of entry used for the movement of livestock, such as Santa Teresa, in New Mexico.

In Chihuahua, the municipality with the highest number of active cases is Matamoros, with 13, followed by Coronado, with nine; Balleza, with five; and Jiménez and Rosales, with four each. Other municipalities with active cases include Aldama, Allende, Camargo, Chihuahua, Delicias, Hidalgo del Parral, Huejotitán, López, and Nonoava. Juárez appears on the list with one active case.

The Senasica report comes at a sensitive time for the border, due to the process of reopening US ports to Mexican livestock trade.

On July 24, 2026, the United States Department of Agriculture (USDA) announced a coordinated and gradual reopening of the southern livestock ports, conditioned on Mexico's compliance with the Joint Action Plan against the screwworm.

The first port considered is Douglas, Arizona, which borders Sonora and whose reopening is scheduled for August 24.

Subsequently, the USDA's Animal and Plant Health Inspection Service (APHIS) will evaluate the possibility of reopening Santa Teresa and Columbus, New Mexico, for the entry of live cattle, bison, and horses.

Although Santa Teresa does not yet have a definitive reopening date, this will depend on the evaluation of the US authorities after Douglas.

The USDA itself warns that the reopening schedule is flexible and may be modified according to the evolution of the health situation in Mexico. Specifically, it notes that the reopening of the ports could be paused if U.S. authorities identify an increased risk in Sonora or Chihuahua, whether through post-reopening audits, on-site observations, or other available information.


https://oem.com.mx/elheraldodejuare...e-gusano-barrenador-en-ciudad-juarez-31620665
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We are strengthening actions in Sonora after the detection of a screwworm case

Brigades are operating to track, control movement, and release sterile flies.

National Service for Agrifood Health, Safety and Quality | August 20, 2026
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Senasica strengthens health surveillance and control after detection of screwworm case in Sonora


Senasica is reinforcing containment efforts against the cattle screwworm (GBG) in Sonora by deploying territorial sweep brigades, strengthening movement controls, and dispersing sterile flies on the ground in the area.

The intensification of the measures responds to the confirmation of a case of GBG myiasis in a five-year-old female bovine, located on a free grazing property in the town of Munihuasa, municipality of Álamos, which has approximately 40 cows, of which only one presented GBG myiasis.

Because Munihuasa is located in a strategic geographical transition zone near the borders of Sonora, Chihuahua and Sinaloa where wind currents facilitate the natural transit of the fly, the risk area was immediately delimited, a sanitary protection ring was implemented, doramectin was applied to the cattle in the surrounding areas, and the ground release of sterile flies began.

Senasica will maintain permanent epidemiological surveillance throughout the region and urges livestock farmers to periodically check their animals, treat wounds immediately, and report any presence of larvae through the telephone line 800 751 2100, the WhatsApp chat 55 3996 4462, or the email address gestioncpa.dgsa@senasica.gob.mx to promptly address reports of suspected GBG cases.


​https://www.gob.mx/senasica/articul...a-tras-deteccion-de-caso-de-gusano-barrenador
 
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Screwworm advances in dogs in Cancun

Local/Quintana Roo
August 31, 2026
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Editorial Staff/Sol Quintana Roo

Cancun - Cases of dogs treated for screwworm infestation in Cancun have increased 166 percent in recent months, going from 15 cases in May to 40 currently, according to information from the Institute of Animal Welfare and Protection.

Although most of the affected animals are strays, the organization has already identified some cases in dogs with owners, so the problem is beginning to spread beyond abandoned animals.

One of the main difficulties is detecting injuries early. Some animals have been transferred when they have severely infested wounds, are weakened, and in some cases, unable to stand, which considerably reduces their chances of recovery.

Among the areas of Cancun where a higher incidence has been observed are Tres Reyes, Valle Verde and Villas del Mar, sectors that also face a high presence of homeless dogs.

Infestation occurs when the fly lays its eggs in open wounds or mucous membranes. The larvae then burrow into the tissues and feed on living flesh, so a seemingly minor injury can quickly become a serious problem. For any wound or inflammation, it is recommended to take the animal to a veterinarian and avoid home remedies.

The increase in cases in the city comes as Quintana Roo faces a broader situation due to the presence of the parasite. Official records show around 1,000 cases in animals, mainly livestock in the southern part of the state, in addition to 12 cases of human myiasis in the state.

 
Related to post 118

Translation Google


Second human death from screwworm myiasis confirmed in Oaxaca

The woman had injuries to her gums, so a fly entered her mouth and laid its eggs
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The woman died on September 5; however, the cause of death was only recently confirmed. | Photo: Special
Álvaro Morales
Oaxaca, Oaxaca /14.10.2026 15:42:39

Health authorities in Oaxaca confirmed the second death resulting from screwworm myiasis in the state.

The victim, who died on September 5 , was a woman over 80 years old from the district of Miahuatlán de Porfirio Díaz, in the southern mountains of the state, who, according to hospital reports, required permanent help to move around and suffered from gum injuries .

This caused a fly to enter the oral cavity and lay its eggs in one of the wounds without its caretakers noticing.

Although the woman died on September 5, the cause of her death was only confirmed within the last 24 hours. Health authorities indicated that she died in a hospital of the Mexican Social Security Institute (IMSS).

First victim, an elderly person; died in April
The victim added to a death resulting from screwworm myiasis confirmed on April 14 by state authorities; it was an 88-year-old man from the town of Santa Cruz, belonging to San Pablo Etla, in the Central Valleys of Oaxaca.

The man died on April 9 at the "Aurelio Valdivieso" Civil Hospital in the city of Oaxaca.

At the time, it was reported that the man suffered from comorbidities such as untreated Parkinson's disease , which left him bedridden. As with the second victim, the screwworm infestation was reported in the mouth.

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Two new deaths from screwworm myiasis in humans confirmed in Mexico

The federal Health Ministry confirmed two new deaths from myiasis caused by Cochliomyia hominivorax, bringing the total number of deaths to eight since the outbreak began.


César Cubero
Monterrey, Nuevo León /21.10.2026 11:21:00

The Federal Health Secretariat confirmed two more deaths in Mexico from myiasis caused by Cochliomyia hominivorax in humans (cattle screwworm) , one in Nayarit and one in Puebla ; so now the total in the country, as of week 40 and as of October 16, is eight deaths from this cause.

Of these, the authority specified, two were registered in Oaxaca, two in Veracruz, and one in the states of Nayarit, Puebla, Querétaro and Yucatán.

Meanwhile, regarding cases treated at health centers, 23 were reported in week 40, bringing the national total to 780.

Of that total, 85 percent, or 663, are patients treated this year,
compared to 117, or 15 percent, in 2025 ; while none of the eight deaths were recorded last year.

Based on official statistics, it is noted that Nuevo León remains with four positive cases of this disease and no deaths due to this cause.

On the data side, the Epidemiological Bulletin indicates that of the 23 cases in week 40, Puebla led with four, followed by Jalisco with three, and Chiapas and Veracruz with two.

And from Mexico City, Coahuila, Guanajuato, Guerrero, Hidalgo, Michoacán, Morelos, Nayarit, Oaxaca, Quintana Roo, San Luis Potosí and Yucatán with one.

Likewise, the official weekly report highlights that at the national level, of the total cases in the years 2025 and 2026, the top 6 federal entities with the most people infected by the screwworm are Chiapas with 171, Veracruz with 125, Puebla with 74, Oaxaca with 70, Yucatán with 54 and Guerrero with 41.

mrg
 
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