06/18/2026
Most pet owners have never heard of New World screwworm, yet it’s one of the most destructive parasites affecting animals. Unlike typical maggots that feed on dead tissue, screwworm larvae invade and feed on living tissue. Combined with the fact that a single female fly can lay hundreds of eggs in or near a wound, a minor injury can quickly become a serious medical concern.
While there are no confirmed cases in New England at this point, it is something to be aware of! There have been 12 confirmed cases in states like Texas and New Mexico. As pet parents, you should be aware of the warning signs, prevention, and treatment strategies.
To help protect your pet:
🪰 Check your pet daily for wounds, cuts, swelling, and skin irritations. Screwworm flies are attracted to open wounds, tick bites, ear infections, hot spots, surgical incisions, and other areas of damaged skin.
🪰 Keep all wounds clean, protected, and treated promptly. Any cut, scratch, or skin lesion should be monitored closely and never left unattended.
🪰 Know the warning signs of infestation. Watch for swelling, discharge, a foul odor, excessive licking, pain, or a wound that appears to be getting larger instead of healing. Contact your veterinarian immediately if you notice any of these signs.
🪰 Use fly-control measures and repellents consistently, especially if your pet has a wound or recent surgical site.
🪰 Some common flea/tick preventions such as Nexgard, Capstar, and Credelio Quattro are approved for treatment and prevention of Screwworms -- yet another reason to stay up to date on your pet's monthly preventatives!
