The U.S. government is taking decisive action against an outbreak of the New World Screwworma parasitic fly that feeds on the flesh of warm-blooded animals. This invasive pest poses a significant threat to livestock and pets, prompting a coordinated response from federal agencies.
The Centers for Disease Control and Prevention (CDC) has activated its emergency response at level 3the agency’s lowest level of alert. Although human infections are rare, the CDC documented a case in 2026 involving a traveler returning from Central America, where the pest is common.
Current Outbreak and Affected Areas
The current outbreak has affected at least nine animals in Texas and New Mexicoincluding cattle, goats, and a dog. The U.S. Department of Agriculture (USDA) is closely monitoring the situation through its tracking system.
In response to the outbreak, neighboring states like Colorado have implemented precautions. These include restrictions on animal transportation and new inspection rules for cats and dogs entering the state. Maggie BaldwinColorado’s state veterinarian, emphasized the challenges posed by this pest: “New World Screwworm is a challenging pest. Not only does one case obviously harm the animal that has been affected, but the response to one single case can be very robust, it can be very is costly not only to the animal owners but it’s costly to the state and the federal government.”
Federal Response and Prevention Efforts
The U.S. Department of Health and Human Services (HHS)led by Robert F. Kennedy Jr.is maintaining an aggressive approach to stop the spread and eradicate the pest. This week, the Food and Drug Administration (FDA) approved an emergency medication for cats and dogs, should infestations reach domestic animals. The approved medication, generic Nitenpyram tabletscan be used to treat dogs and cats that weigh at least two pounds and are at least four weeks old.
The USDAunder the leadership of Brooke Rollinshas deployed 110 full-time staffers to address the problem. The agency has released millions of sterile flies in Texas as part of its efforts to control the pest’s spread. Rollins stated, “This technology works and it is proven over and over again.”
Public Health and Safety Measures
While the risk to humans is low, the potential impact on livestock and pets is significant. The USDA’s proactive measures, including the release of sterile flies and the implementation of strict inspection protocols, aim to prevent the establishment of a screwworm population in the affected regions.
Animal owners are advised to remain vigilant and report any signs of infestation to local authorities. The coordinated efforts of federal agencies and state veterinarians are crucial in mitigating the spread of this destructive parasite and protecting the health of animals across the United States.
