New World Screwworm has been making headlines recently after new cases were identified in parts of North America. While the parasite remains rare in the United States, many pet owners are asking the same question: is this something I need to worry about for my dog or cat?

The short answer is probably not — especially here in Oregon. But it’s worth understanding what New World Screwworm is, why veterinarians are paying attention to it, and how routine parasite prevention helps protect pets.

Here’s what Salem pet owners should know.

What Is New World Screwworm?

New World Screwworm (NWS) is a parasitic fly whose larvae feed on living tissue in warm-blooded animals. Dogs, cats, livestock, wildlife, and even people can be affected.

Unlike many parasites that feed on dead or damaged tissue, screwworm larvae invade healthy tissue, which can cause significant damage if left untreated.

The parasite was successfully eradicated from the United States in the 1960s. However, recent detections in Mexico and areas near the southern U.S. border have prompted renewed monitoring efforts by veterinarians, livestock producers, and public health officials.

Can Pets Get It?

Yes. Dogs, cats, and other animals are susceptible to New World Screwworm.

The adult fly is attracted to open wounds and irritated skin. Even relatively minor injuries, such as scratches, insect bites, surgical incisions, or hot spots, can attract the fly.

While the current risk remains very low in Oregon, it’s always important to monitor wounds closely and seek veterinary care if they aren’t healing normally.

Signs that may warrant veterinary attention include:

  • A wound that is getting worse instead of better
  • A foul or unusual odor coming from a wound
  • Swelling, discharge, or unexpected tissue damage
  • Visible larvae within or around a wound

If you notice any of these signs, contact your veterinarian as soon as possible.

Can People Get It?

Technically, yes. New World Screwworm can affect any warm-blooded animal, including humans.

Human cases are rare and are typically associated with travel to areas where the parasite is actively present. At this time, the risk to people in Oregon remains extremely low.

What Can Be Done to Prevent or Treat It?

One of the best ways to protect pets from many parasite-related health concerns is to keep them current on veterinarian-recommended preventive care.

For dogs, Credelio Quattro has received FDA approval for the treatment of New World Screwworm and has demonstrated excellent efficacy against screwworm larvae within 24 hours. In addition to treating screwworm infestations, it also protects against fleas, ticks, heartworm disease, and several intestinal parasites.

For cats, Credelio CAT has received FDA Emergency Use Authorization for the treatment of screwworm infestations.

Our Take

For Salem pet owners, New World Screwworm is not currently a major threat. But emerging diseases have a way of reminding us why preventive care matters.

Keeping wounds clean, addressing skin problems promptly, and staying current on parasite prevention remain some of the simplest ways to help protect your pet’s health.

If you have questions about parasite prevention or want to make sure your pet is on the right preventive plan, our team is always happy to help.

Give The Pet Clinic a call to discuss the options that make the most sense for your pet.