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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →If your dog or cat has maggots or white egg masses in a wound or body opening, contact a veterinarian immediately and report the suspected infestation to animal-health officials. New World screwworm can cause severe tissue damage, and waiting for a wound to worsen can put your pet at greater risk. Local risk changes, so check current USDA and state updates rather than assuming every area has the same exposure.
What is New World screwworm?
New World screwworm (NWS), Cochliomyia hominivorax, is a fly whose larvae infest wounds or body openings and feed on living tissue. Dogs and cats can be affected, as can livestock and wildlife. The larvae burrow into tissue, and an infestation can cause serious damage and may be deadly. USDA APHIS explains the disease and prevention measures.
What are the signs of screwworm in dogs and cats?
According to USDA’s February 2026 pet factsheet, watch for these signs:
- Maggots or white egg masses in a wound or body opening, including the eyes, ears, nose, mouth, or genitals.
- A foul odor or smell of decay.
- Pain-related changes, such as irritated behavior, depression, not eating, or withdrawing from people or other animals.
These signs warrant immediate veterinary attention; do not wait to see whether the wound gets larger. Read USDA’s pet factsheet for signs and response guidance.
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What should you do if you suspect an infestation?
- Call a veterinarian immediately. Describe what you saw and where it is. USDA also advises contacting your state veterinarian’s office or USDA about suspected cases.
- Follow veterinary instructions for care and transport. Do not try to treat an infestation with a home remedy or an insecticide chosen without veterinary advice.
- Report the suspected case promptly. USDA asks people to report suspicious wounds, maggots, or infestations. Use the USDA current-status page to find current detection information and reporting links.
USDA’s direction is: “Animals infested with NWS should be treated according to their veterinarian’s recommendations.” USDA APHIS New World screwworm guidance.
How do you protect a pet from screwworm?
- Monitor your pet for wounds and the signs listed above, and contact a veterinarian if you find anything suspicious.
- If your pet will travel internationally, discuss exposure risks and veterinary examinations before and after travel, especially when visiting an affected country.
- Ensure pets traveling internationally are inspected as recommended by your veterinarian and the relevant authorities.
- Check live USDA and state status information because detections and infested-zone boundaries can change.
USDA’s pesticide list for NWS is not an endorsement of the listed products. Use is limited by each product’s label and permitted application site; a product listed for one use should not be assumed safe or appropriate for a dog or cat.
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- HEALING AID & SKIN REPAIR: Use a few times daily to flush dog cuts, abrasions, sores, and skin irritations
- PET FIRST AID ESSENTIAL: Works great on all animals at all life stages to help provide relief to skin problems
- SAFE & EFFECTIVE: Made with a non-toxic hypochlorous technology that is pH-balanced and safe if licked
- VETERINARIAN RECOMMENDED: Support wound healing with this anxiety-free, cost-effective alternative to antibiotic or steroid ointments.
- TRUSTED BRAND: Vetericyn is a leader in at-home animal health products manufactured to help pet owners take the best care of their animals
What treatment options are available?
Veterinary treatment depends on the individual animal and the current regulatory status of available drugs. The FDA’s animal-drug page lists authorized options, including generic nitenpyram tablets among options for dogs and cats. As of September 3, 2026, FDA reported 15 emergency use authorizations and three conditional approvals for animal drugs against NWS. Those are counts of regulatory actions, not a statement that every listed drug is suitable for every pet.
Do not choose a product or dose based on a list or on another animal’s treatment. Ask a veterinarian to assess your pet and consult the FDA’s current New World screwworm animal-drug information, since authorizations and product details can change.
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What should dog owners know about travel to the United States?
USDA’s February 2026 factsheet says dogs arriving in the United States from NWS-affected countries—including dogs returning to the country—need a health certificate signed by an official government veterinarian. The certificate must confirm that the dog was inspected for NWS within five days of travel and was found not to be infested. USDA warns that dogs showing signs may be denied entry and returned to the country of departure at the owner’s expense.
This certificate instruction is specific to dogs; do not assume it applies to cats. Requirements can change, so check current entry rules before departure. USDA’s pet travel factsheet provides the cited guidance.
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Where can you check current local risk?
USDA’s current-status page, modified October 2, 2026, links to the U.S. confirmed-detection dashboard and a Texas infested-zone map. Use those live resources and your state animal-health authority for local information; a dated map or general national update cannot establish your pet’s current local exposure risk. Check USDA’s current NWS status.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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