New Mexico Confirms Six Screwworm Cases
State officials are battling a spreading infestation of New World screwworm in livestock and pets across multiple counties.
Updated on Oct. 24, 2026 in Large Animals
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New Mexico has confirmed six total cases of the New World screwworm across the state. Officials have responded to the outbreak by expanding the infested zone in Grant County and implementing aerial distribution of sterile male flies.
Why it matters
Recent high rainfall and warm temperatures have created ideal habitat conditions for the flies to thrive. Preventing the spread is critical for protecting the health of livestock and household pets across the region.
New Mexico has confirmed six screwworm cases, including recent infections in Otero and Hidalgo counties. Adult flies are unable to survive at temperatures below 40 degrees, though pupae can remain viable in soil throughout freezing conditions.
The players
New Mexico State Veterinarian
This office manages animal disease control efforts and provides public health guidance during livestock outbreaks.
The details
Animals moving out of an designated infection zone must obtain a movement certificate, which is valid for five days or three days for livestock destined for slaughter. Aerial distribution of sterile flies is conducted on Mondays and Thursdays to combat the population.
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.
Culture Shift
This outbreak represents a return to intensive management protocols established by the USDA screwworm eradication program. It follows a shift toward sustainable livestock health monitoring as environmental conditions favor pests that were previously contained.
Pet owners and livestock producers must obtain movement certificates for animals leaving an infection zone to help contain the spread. Residents should monitor their animals closely for signs of infestation and follow state safety directives.
The takeaway
While freezing temperatures will eventually kill adult flies, pupae remain a threat in the soil even during winter. Producers should prioritize inspections and adhere to official movement restrictions to protect local animal health.
What happens next
A sterile fly production facility in Chiapas is expected to reach an output of 100 million flies per week by the end of 2026. A facility at Moore Air Force Base in Texas will begin production in April 2027.
Further reading
Learn more about local herd management and health protocols in the New Mexico Large Animals section.
More information
For official guidance and reporting instructions, visit the New World screwworm information portal.
Source note: This article includes information reported by THE SILVER CITY DAILY PRESS.
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