Screwworm Infection After El Salvador Travel – U.S. Case
U.S.Resident Diagnosed with New World Screwworm After Travel to El Salvador
Confirmation of the Case
The Centers for Disease Control and Prevention (CDC) confirmed on August 4th the diagnosis of New World screwworm in a U.S.resident who had recently traveled to El Salvador. Federal health officials acknowledged the infection in an emailed statement on Monday. The CDC collaborated with Maryland health officials on the case.
About New World Screwworm
New World screwworm is a fly that lays its eggs in open wounds and body openings, such as the eyes, ears, nose, or mouth.While it primarily affects livestock,human infections are rare. According to U.S. health officials, the disease does not spread from person to person and poses a very low risk to the public.

Impact on Livestock
The parasite poses a greater concern to ranchers, as cattle infestations have been moving northward through Central America and Mexico. The CDC is working with the U.S. Department of Agriculture (USDA) to monitor and prevent further spread.
Economic Impact on Ranching
Screwworm infestations can cause notable economic losses for ranchers due to decreased livestock productivity, treatment costs, and potential trade restrictions. Eradication programs are crucial for protecting the agricultural industry.
FAQ: new World Screwworm
- What are the symptoms of New World Screwworm in humans?
- Symptoms can include pain, swelling, and discharge from the affected wound. Visible larvae may also be present.
- How is New World Screwworm treated?
- Treatment typically involves removing the larvae from the wound and administering antibiotics to prevent secondary infections.
- How can I prevent New World Screwworm infection?
- Avoid open wounds and practise good hygiene. If traveling to areas with known outbreaks, take extra precautions to protect any cuts or abrasions.
Timeline of Recent Screwworm Outbreaks
| Year | Location | Details |
|---|---|---|
| 2016 | Florida,USA | Screwworm outbreak in Key deer population. |
| 2018-Present | central America & Mexico | Ongoing northward movement of screwworm infestations in cattle. |
| 2024 | El Salvador | Outbreak leading to U.S. travel-related case. |
