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US - USDA Confirms Presence of New World Screwworm in the United States - June 3, 2026 - current

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​https://www.aphis.usda.gov/animals/...e/current-status/us-confirmed-cases-new-world

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Sixty Years of Clean Land. Then the Cartels Sent the Cows.


New World screwworm reached US soil June 3, 2026 — not through natural dispersal, but through 800,000 smuggled cattle per year moving through cartel-controlled biosphere reserves without inspection, documentation, or interdiction. USDA's answer: $100 million for satellite surveillance and a drone Grand Challenge. The pipeline keeps running.

Beef News·Thursday, June 18, 2026​

more.... https://beefnews.org/sixty-years-clean-land-then-the-cartels-sent-the-cows/
 
USDA Reports 3 More Screwworm Detections (Texas)






#19,214

After going more than a week without any new reports, late yesterday the USDA updated their New World Screwworm dashboard to show 3 new detections; 2 (cattle) in Edwards County, Tx, and 1 (sheep) in Crockett County, Tx.

Previously, Edwards county had reported 2 cases (1 cattle, 1 goats), while this is the first report from Crockett county.​

As discussed previously, the New World Screwworm (NWS) fly lays its eggs in exposed wounds on practically any warm-blooded animal, including birds. While reported cases remain low, most of our surveillance is among livestock, while infections in the wild go largely unmonitored.

The CDC describes its life cycle as:

New World screwworm infestations begin when a female fly lays eggs on open wounds or other parts of the body in live, warm-blooded animals. Most infestations occur in animals, but they also occur in people. The smell of a wound or body opening such as the nose, mouth, eyes, ears, or genitals can attract female flies. Wounds as small as a tick bite may attract a female fly to lay her eggs. One female can lay 200 – 300 eggs at a time and may lay up to 3,000 eggs during her 10- to 30-day lifespan.

Eggs hatch into maggots that burrow into the wound to feed on the living flesh. After feeding for about 7 days, larvae drop to the ground, burrow into the soil, and emerge as adult screwworm flies.​



The arrival of the NWS this early in the summer maximizes the number of cycles that may occur before winter weather sets in, which greatly limits the spread and survival of the NWS.

While the USDA continues to release sterile flies in the infested areas, it will take many months - possibly more than a year - to ramp up sterile fly production enough to combat a multi-state outbreak.​

This is only part of the USDA's 8-part plan (see below) to try to contain this threat.




The ultimate goal is not only to eradicate the NWS in the United States, but also to drive the screwworm back south to its old control line - below the Darien Gap in Panama - to prevent yearly reintroductions from Northern Mexico.

All of which means winning this battle will likely take years, not months.​

Meanwhile, state veterinarians from as far north as Minnesota are considering their options (see MPR News Minnesota state veterinarian worries New World screwworm could enter the state).

Stay tuned.


https://afludiary.blogspot.com/2026/06/usda-reports-3-more-screwworm.html

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Texas: New World Screwworm (NWS) Now Reported in 10 Counties


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#19,223

The spread of the New World Screwworm (NWS) in Texas continues to accelerate with 10 counties now reporting detections in livestock. Thus far, we've not seen any reports in wildlife, although they must certainly exist.

Currently Edwards county has reported the most detections (n=6), followed closely by Crockett County (n=5).​




Given the life cycle of the NWS can be as short as 21 days (see below) we are likely already well into the second generation in Texas, which may account for the doubling of cases reported over the past 7 days.


Note: The NWS is extremely cold intolerant, and can only successfully overwinter in extreme south Texas and Southern Florida (and then, only during mild winters).​

While the return of cold weather in the fall should kill off the NWS population in the United States, we could see 5 or 6 more generations emerge before then, each likely larger than the last.

At least, until the release of sterile flies begins to have an effect.​



Reportedly, the USDA is able to disperse between 4 and 8 million sterile screwworm flies per week into the known infested counties of Texas.

New production facilities are being constructed, including a massive sterile fly production facility at Moore Air Base in South Texas, which is expected to produce 100 million sterile flies per week by November 2027 (increasing to 300 million a week by the end of 2028).​

If we start seeing a decline in cases later in the summer, it could be an early indication the program is having an impact. Until then, Texas (and potentially other states) have a long hot battle ahead.


https://afludiary.blogspot.com/2026/06/texas-new-world-screwworm-nws-now.html
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From:
"U.S. Food and Drug Administration" <usfda@public.govdelivery.com>
To: "FluTrackers" <flutrackers@earthlink.net>
Subject: FDA Issues Emergency Use Authorization for Drug for Short-Term Prevention of New World Screwworm in Horses
Date: Jul 15, 2026 5:33 PM
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FDA Issues Emergency Use Authorization for Drug for Short-Term Prevention of New World Screwworm in Horses


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To advance the Trump administration’s actions to safeguard American agriculture, the U.S. Food and Drug Administration today issued an Emergency Use Authorization (EUA) for Ivermectin Liquid for Horses (ivermectin oral solution) for the short-term prevention of New World screwworm (NWS) infestations (myiasis) in horses. The product is authorized for use when administered within 24 hours of birth or at the time of initial wound care. Ivermectin Liquid for Horses is not for use in species other than horses.

“The Trump administration will use every available tool to stop New World screwworm from threatening America’s horses and livestock,” said U.S. Health and Human Services Secretary Robert F. Kennedy, Jr. “This EUA expands our defenses, strengthens our preparedness, and helps protect the animals, producers, and communities that drive American agriculture."

"President Trump has directed his entire administration to do what it can to combat and stop the spread of New World screwworm. We at USDA have been working with our federal partners to prepare for any potential infestation of animals that may occur as a result of New World screwworm, and today’s announcement is another step in the right direction," said U.S. Department of Agriculture Secretary Brooke L. Rollins. "HHS and FDA have stepped up to the plate and have moved at Trump speed to authorize as many treatments as needed to protect our livestock, wildlife, and companion animals. I am thankful to Secretary Kennedy for getting this authorization across the finish line and ensuring our horse population has access to preventative measures, should they need it.”

NWS is a parasitic fly whose larvae feed on the living tissue of warm-blooded animals. Newborn animals with healing umbilical wounds and animals with open wounds are particularly vulnerable to infestations, as NWS flies are attracted to these sites to lay their eggs. Left untreated, infestations can be severe and life-threatening.

Based on the totality of the scientific evidence available, the FDA has concluded it is reasonable to believe that Ivermectin Liquid for Horses may be effective in the short-term prevention of NWS myiasis in horses when used as authorized, and the known and potential benefits of the product outweigh its known and potential risks.

“The Trump administration is leaving no stone unturned in our fight to shield American ranchers, livestock producers, and the agricultural economy from this threat,” said Acting FDA Commissioner Kyle A. Diamantas, J.D. “This marks the FDA’s 11th Emergency Use Authorization deployed against New World screwworm, and we will continue to use all available authorities, act with maximum speed, and deliver tools to protect animals in the U.S.”

This EUA authorizes Ivermectin Liquid for Horses only for short-term prevention of NWS myiasis, not treatment. If a wound is already infested, or if an infestation develops after administering Ivermectin Liquid for Horses, contact a veterinarian to discuss treatment options.

“This authorization provides a short-term prevention option for horses, but owners and veterinarians should be aware of the limitations,” said Timothy Schell, Ph.D., director of the FDA’s Center for Veterinary Medicine. “This product's window of prevention lasts no more than 24 hours, so it is important that the product be used alongside other preventive measures such as bandaging, repellents, and other fly-control methods."

Ivermectin Liquid for Horses is a clear, ready-to-use solution and can be administered as an oral drench or via a tube going from a horse’s nose to its stomach. This product is available only by prescription from a licensed veterinarian. Do not use this product in species other than horses.

Detailed product information about Ivermectin Liquid for Horses can be found in the Fact Sheet: Emergency Use Authorization of Ivermectin Liquid for Horses (ivermectin oral solution) for New World Screwworm (NWS).

This EUA will be effective until it is revoked or the HHS Secretary terminates the declaration that the potential public health emergency presented by NWS justifies the emergency use authorization of animal drugs for NWS.

Ivermectin Liquid for Horses is sponsored by Alberta Vet Labs Ltd. based in Canada.
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Press Release

USDA Announces Phased Reopening of Southern Ports for Livestock Trade
Published:
July 24, 2026

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(Washington, D.C., July 24, 2026) – The U.S. Department of Agriculture (USDA) is announcing a coordinated, phased reopening of southern cattle ports, contingent on Mexico’s adherence to the Joint Action Plan. Beginning August 24, 2026, USDA will open the Douglas, AZ port of entry to cattle trade, while simultaneously initiating the operational steps necessary for subsequent openings at the Santa Teresa, NM, and Columbus, NM, ports. Every animal entering the United States through these ports will undergo a full USDA inspection to ensure it is free of any signs of New World screwworm (NWS).

“Protecting the United States from NWS and pushing this pest out of Mexico and back to the Darien Gap is a top priority at USDA and has the full attention of the Trump Administration,” said U.S. Secretary of Agriculture Brooke L. Rollins. “The closure of the Southern ports of entry for the last year has been a tough but necessary action to control the spread of NWS in Mexico and protect the American livestock industry. Thanks to the work across the federal government as well as state, local, and industry partners, it is now safe to reopen the Douglas, Arizona, port in 30 days to resume the hundreds year old movement of cattle.”

For many years, Sonora and Chihuahua have maintained a strong animal health infrastructure program, built on the backs of successful animal disease control measures. While the rest of Mexico has not been able to stop the spread of the screwworm or stop legal and illegal movement, Sonora and Chihuahua do have a track record of success in these spaces, giving USDA confidence that they can do the job.

USDA proposes a phased reopening of Southern ports to livestock trade, contingent upon satisfactory progress on priority Action Plan milestones.
  • Sonora and Chihuahua are identified as the lowest-risk Mexican states for New World screwworm due to their strong, well-established inspection programs and their geographic distance from southern Mexico, where most cases are concentrated.
  • On August 24, 2026, USDA will reopen the Douglas, AZ, port, which borders Sonora, to livestock trade. The closest active case to the Douglas, AZ, port is ~325 miles detected on July 22, 2026. After evaluating the success of the initial reopening and potential impacts or risk assessment changes, APHIS will then consider reopening the Santa Teresa, NM, and Columbus, NM, ports to live cattle, bison, and horses.
  • The reopening timeline will remain flexible and may be adjusted based on Mexico’s progress in meeting Action Plan milestones and addressing critical issues.
  • The opening of ports may be paused if USDA identifies increased risk in Sonora or Chihuahua via post-opening audits or other observations/information.
For more information about USDA’s New World screwworm response, read here: www.aphis.usda.gov/animals/animal-health/livestock-and-poultry-disease/stop-screwworm/usda-continues-lead-aggressive

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https://www.usda.gov/about-usda/new...ased-reopening-southern-ports-livestock-trade
 
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