New Mexico Confirms Cases of New World Screwworm
Owners of pets and livestock should monitor for symptoms and secure movement certificates for travel.
Updated on Oct. 24, 2026 in Large Animals
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New Mexico officials have confirmed six total cases of New World screwworm in pets and livestock across the state. Residents with animals in affected counties must now follow specific inspection protocols for transporting their pets or livestock.
Why it matters
High rainfall and unseasonably warm temperatures have created ideal conditions for these parasites, which can pose serious health risks to pets and livestock. Managing the spread through sterile fly distribution is critical to protecting domestic animals and the regional agricultural economy.
State authorities have confirmed six cases across Lea, Grant, Otero, and Hidalgo counties. Movement certificates for animals are now required, with standard permits valid for 5 days and those for animals headed to slaughter valid for 3 days.
The players
New Mexico State Veterinarian
The state authority managing animal disease outbreaks and public outreach efforts regarding livestock health.
Moore Air Force Base
A military installation in Texas currently serving as the site for a forthcoming sterile fly production facility.
The details
New World screwworm larvae infest living tissue, causing severe health complications for animals. Adult flies are highly sensitive to cold, dying when temperatures drop below 40 degrees, though pupae can survive in soil through freezing weather. To disrupt the breeding cycle, authorities are using aerial distribution of sterile male flies on Mondays and Thursdays.
Timeline
June 2026: First screwworm case confirmed in Lea County.
September 2026: First case confirmed in Grant County.
October 5, 2026: Aerial distribution of sterile flies began.
October 15, 2026: Two screwworm cases confirmed in Grant County.
October 24, 2026: State veterinarian holds public meeting.
The Home Front
The state's response aligns with established Sterile Insect Technique eradication protocols used to control pest populations. This development follows recent regional trends of elevated humidity and warmth that have expanded the viable habitat for these agricultural pests.
Owners with animals in Grant, Otero, Hidalgo, or Lea counties should monitor their pets and livestock closely for any unusual wounds. If you are planning to move your animals, ensure you obtain the required movement certificate before departure.
The takeaway
While the current infestation is concentrated in specific counties, all pet and livestock owners in New Mexico should remain vigilant as cold weather approaches. Contact your local veterinarian immediately if you suspect an infestation in your animals.
What happens next
A new sterile fly production facility in Chiapas expects to reach 100 million flies per week by year-end, while the Moore Air Force Base facility is scheduled to begin production in April.
Further reading
For more information on managing livestock health, visit Large Animals.
More information
For official guidance and reporting procedures, visit the New World screwworm information portal.
Source note: This article includes information reported by THE SILVER CITY DAILY PRESS.
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