New World Screwworm

The chewable tablet is now available under an emergency use authorization to treat New World screwworm infestations in eligible dogs and puppies.

The new surveillance tool combines confirmed detections, environmental conditions, and media reports to help public health officials identify emerging New World screwworm threats and estimate where cases could appear next.

This wound spray is authorized for sheep, cattle, goats, swine, camelids, and select wildlife species as New World screwworm continues to spread in the US.

Drawing on insights shared by federal officials at the USDA, FDA, and CDC during a joint session at the 2026 AVMA Convention, along with the latest federal guidance, agency data, and published resources, this report explains what veterinarians need to know about the flesh-eating parasite.

The prescription oral solution is authorized for short-term prevention in horses as New World screwworm cases in the US continue to rise.

On the latest episode of Vet Watch from dvm360, parasitologist Kathryn E. Reif, PhD, MSPH, separates science from panic on New World screwworm—from myths and clinical signs to sterile fly production and food safety.

Sid Miller says injectable treatment alone can't protect large herds or wildlife as the parasite spreads across Texas counties.

dvm360's weekly tracker of confirmed New World screwworm (NWS) detections in the US. Here's the update for July 3, 2026.

After nearly 60 years of successful eradication in the US, the New World screwworm has reemerged, prompting renewed surveillance and containment efforts.

A dozen VET members from Texas A&M University deployed June 13, 2026 in support of Texas Animal Health Commission field operations.

New World screwworm cases rise to 9 as FDA emergency authorizes OTC treatment for pets, plus the launch of a generic for congestive heart failure in dogs.

Generic Nitenpyram Tablets become the first generic animal drug authorized under an FDA Emergency Use Authorization to treat New World screwworm myiasis in eligible dogs, cats, puppies, and kittens.

A list of available treatments for screwworm infestations in cattle, horses, sheep, goats, deer, swine, cats, dogs, exotic, zoo, and wildlife species, as well as guidance for practitioners before using these products.

Federal officials have confirmed additional New World screwworm detections in Texas and New Mexico, bringing the total to 5 cases in 6 days, including the first in a companion animal since the parasite’s return to the United States.

Christopher Lee, DVM, MPH, DACVPM, DACVM (Parasitology), on why the NWS detection in Texas signals something far bigger—and what clinicians need to do now. Plus: early warning signs, identification, lab submission, and risk to pets.

Coverage of New World screwworm detections, FDA treatment authorizations, and response efforts across animal health and agriculture as the parasite reemerges in the United States.

The affected animal is a 3-week-old calf in Zavala County, Texas. To date, APHIS has reported no further detections.

Zoetis' doramectin injection is now indicated for use in dairy cows, horses, sheep, swine, and deer to help mitigate NWS myiasis.

A US Environmental Protection Agency emergency exemption is allowing US officials to import Tanidil as part of a growing federal response to prevent New World screwworm from entering the country.

The authorization adds to a growing list of treatments cleared under emergency use as federal agencies ramp up efforts to prevent New World screwworm from reestablishing in the United States.

The FDA emergency use authorization (EUA) expands the New World screwworm treatment tool kit to cattle, small ruminants, horses, exotic mammals, and wild and pet birds.

The construction of a sterile fly production facility is underway at Moore Air Base in Edinburg, Texas, to help combat New World screwworm (NWS).

F10 Antiseptic Wound Spray with Insecticide received the EUA based on scientific evidence available.

The afoxolaner chewable tablet is the most recent drug to receive an EUA from the FDA to treat New World screwworm in feline and canine patients.

Once eradicated from the US in the 1960s, New World screwworm is again driving prevention efforts as cases move closer to the US-Mexico border.