A confirmed case of the New World screwworm has prompted the New Mexico Livestock Board to implement emergency measures to prevent an outbreak, according to New Mexico Secretary of Agriculture Jeff Witte. The parasitic fly, which infests live animals and can cause severe tissue damage, was detected in a livestock facility in Doña Ana County, prompting immediate action by state officials.
The New Mexico Department of Agriculture announced the discovery on June 5, 2024, after testing confirmed the presence of the screwworm, a species originally found in Central and South America. The state’s livestock industry, a critical economic driver, now faces heightened vigilance as officials work to contain the threat. “This is a serious situation, but we have protocols in place to mitigate the risk,” Witte said during an interview with KTSM 9 News on June 6.
Emergency measures include mandatory quarantines for affected properties, widespread insecticide treatments, and public education campaigns to alert farmers about prevention tactics. The state has also partnered with the U.S. Department of Agriculture (USDA) to monitor the spread of the infestation. “We’re coordinating with federal agencies to ensure we have the resources and expertise needed to address this quickly,” Witte stated.
The New World screwworm (Cochliomyia hominivorax) is known for laying eggs in open wounds of animals, leading to larval infestations that can be fatal if untreated. While eradicated in the U.S. through sterile insect technique programs in the 1960s, the recent case marks the first confirmed occurrence in the country since 2019, according to the USDA. “This is a rare but recurring threat that requires constant surveillance,” said Dr. Sarah Thompson, a USDA entomologist.
Local farmers have been advised to inspect livestock daily for signs of infection, such as lesions or unusual behavior. The New Mexico Livestock Board has also established a hotline for reporting suspected cases. “Early detection is critical,” said Witte. “If we don’t act swiftly, the economic and agricultural impact could be devastating.”
Statewide Response and Public Health Measures
State officials have launched a multi-pronged approach to address the infestation. The New Mexico Department of Agriculture has deployed teams to affected areas to apply insecticides and conduct inspections. The agency has also distributed informational materials to ranchers, emphasizing the importance of keeping animals in enclosed spaces and promptly treating injuries.
The livestock board has issued a directive requiring all animal transporters to undergo additional screening. “We’re working with trucking companies to ensure that no infected animals are moved across state lines,” said Witte. “This is a coordinated effort at every level.”
The public is being urged to avoid releasing or disposing of animal waste in open areas, as the screwworm thrives in such environments. “Even a single undetected case can lead to a larger outbreak,” said Dr. Thompson. “Community cooperation is essential.”
Historical Context and Precedents
The last major screwworm outbreak in the U.S. occurred in 2019, when a confirmed case in Texas led to a months-long eradication campaign. That incident resulted in the treatment of over 10,000 animals and cost the state millions in containment efforts. The current case in New Mexico, while isolated, has raised concerns about the potential for similar challenges.
Historically, the USDA has used sterile insect technique (SIT) to eliminate screwworm populations. This method involves releasing lab-raised male flies that are unable to produce viable offspring, gradually reducing the population. However, the agency has not yet announced plans to deploy SIT in New Mexico, citing the need for further assessment.
“We’re evaluating all options, but our priority is to contain the current situation,” said a USDA spokesperson. “If SIT is deemed necessary, we’ll act swiftly.”
The New Mexico Livestock Board has also partnered with the University of New Mexico to study the genetic makeup of the infestation. Researchers aim to determine whether the screwworm is a new variant or a re-emergence of a previously eradicated strain. “Understanding the origin of this case is crucial for preventing future outbreaks,” said Dr. Maria Gonzalez, a UNM microbiologist.
What Comes Next?
State officials plan to hold a public briefing on June 12 to provide updates on containment efforts and answer questions from farmers and residents. The New Mexico Department of Agriculture has also scheduled a series of regional meetings to ensure all stakeholders are informed.
For now, the focus remains on preventing the screwworm from spreading beyond Doña Ana County. “We’re in a race against time,” said Witte. “But with the right measures, we can protect our livestock and our economy.”
