CDC Declares Emergency Over New World Screwworm — Here's What You Need to Know
June 14, 2026
If you haven't heard about New World Screwworm yet, now is the time to pay attention. On June 11, 2026, the Centers for Disease Control and Prevention (CDC) officially activated its Emergency Operations Center in response to a growing New World Screwworm (NWS) outbreak — the first confirmed detections of this parasite in the continental United States in decades.
Cases have already been confirmed in animals across southern Texas and parts of New Mexico, and federal agencies including the CDC, USDA, and Department of the Interior are now working under a unified One Health response to contain it.
What Is New World Screwworm?
New World Screwworm (Cochliomyia hominivorax) is a parasitic fly whose larvae — the actual "screwworms" — burrow into the living flesh of warm-blooded animals, including humans. The fly lays its eggs in open wounds, sores, or body openings. Once the eggs hatch, the larvae feed on living tissue, burrowing deeper as they grow. Left untreated, an infestation can be fatal.
The name comes from the corkscrew-like shape of the larvae as they drill into tissue.
NWS cannot spread from person to person, or from animal to person through contact. The risk comes directly from NWS flies in areas where they are actively circulating. That said, anyone — human or animal — with an open wound in an affected area is potentially at risk.
Why Is the CDC Treating This as an Emergency?
NWS was eradicated from the United States in the 1960s through a landmark sterile insect program. Its return is alarming for several reasons:
- Livestock and companion animals are highly vulnerable. A single infestation in an untreated animal can be deadly within days.
- Human cases are possible. While no human infections have been confirmed in the U.S. yet, the CDC is urging healthcare providers in affected areas to stay alert.
- The fly can spread rapidly. Without aggressive intervention, NWS can move quickly through livestock populations and expand its geographic range.
The CDC has activated a Level 3 emergency response — the opening tier of its 3-level system — to coordinate surveillance, public health messaging, and support for state health departments.
How Ivermectin Fits In
One of the most established and effective tools for fighting screwworm infestations — and parasitic worm infections broadly — is ivermectin.
Ivermectin works by binding to specific ion channels in invertebrate nerve and muscle cells, causing paralysis and death in the parasite. It has been used for decades as a frontline antiparasitic in both veterinary and human medicine. In the context of screwworm and myiasis (the medical term for fly larva infestation), ivermectin is used as part of the treatment protocol to kill larvae and prevent reinfestation.
Beyond screwworms specifically, ivermectin has a well-documented track record against a wide range of parasitic infections, including:
- Intestinal strongyloides
- Onchocerciasis (river blindness)
- Scabies
- Head lice
- Various helminth (worm) infections
As awareness of the NWS outbreak grows and people look for ways to be prepared, having ivermectin on hand is increasingly relevant — not just for pet owners and those with livestock, but for individuals who want access to a proven antiparasitic.
Be Prepared
With the CDC's emergency activation and confirmed animal cases already on U.S. soil, this is not a situation to watch passively. Whether you live in or near an affected area, travel frequently, or simply want to be prepared, having access to antiparasitic medication is a smart, proactive step.
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What to Watch For
The CDC and USDA are actively tracking NWS and will update the public as the situation develops. In the meantime:
- Check animals regularly for unexplained wounds, foul odor, or signs of agitation — these can be signs of an infestation.
- Treat all wounds promptly in both animals and people in affected areas.
- Report suspicious infestations to your local health department or veterinarian immediately.
- Stay informed at screwworm.gov and the CDC NWS situation page.
The Bottom Line
The CDC's emergency declaration is a signal that New World Screwworm is a real and present threat. Ivermectin remains one of the most trusted antiparasitic tools available, with decades of proven effectiveness against the class of parasites NWS belongs to.
Don't wait until there's a confirmed case near you. Stock your medicine cabinet now with Ivermectin 3mg from Shop BP Life — and stay ahead of the outbreak.
Sources: CDC Emergency Operations Center Activation — June 12, 2026 | USDA NWS Case Dashboard | CDC NWS Situation Summary