Screwworm: Control & Prevention | USDA APHIS

Resurgent Parasitic Disease: New World Screwworm cases rise in Central America

A concerning resurgence of New World screwworm (NWS) myiasis – a serious parasitic disease affecting warm-blooded animals, including humans – is prompting health officials to issue travel advisories and strengthen import regulations. Recent reports indicate cases have reappeared in countries where the disease had previously been eradicated,including Belize,Costa Rica,El Salvador,Guatemala,honduras,Mexico,Nicaragua,and Panama.

The re-emergence of NWS poses a critically important public health threat, particularly for travelers and those working with livestock.The disease, caused by the larvae of the screwworm fly, infests living tissue and can cause severe pain, secondary infections, and even death if left untreated.

did you know?-New World screwworm was successfully eradicated from the United States in 1987 through a coordinated aerial spray programme using sterile flies. This program prevented the flies from reproducing.

Human Health Risks and Travel Precautions

Travel to or from the affected countries, especially areas with active animal or human cases, substantially increases the risk of infestation. health officials are urging individuals planning trips to these regions to take proactive measures.

According to public health guidance,travelers should prioritize the following:

• Clean and cover wounds: Even minor cuts and abrasions can become entry points for screwworm larvae.
• Avoid bug bites: Utilize effective insect repellent and wear protective clothing, including loose-fitting, long-sleeved shirts and pants, socks, and hats.
• Secure sleeping environments: Sleep in rooms with screened windows, under a bed net, or inside a screened tent to minimize exposure to flies.
• limit contact with livestock: Avoid spending time in close proximity to livestock or other animals perhaps harboring the parasite.

For detailed facts on specific locations and current risk levels, individuals are encouraged to visit the CDC’s Travelers’ Health website.

Pro tip:-Prompt medical attention is crucial if you suspect a screwworm infestation. Early removal of larvae prevents complications and reduces the risk of secondary infections.

Protecting the United States: Pet and animal Import Regulations

To prevent the spread of NWS into the United States, stringent import requirements are now in effect for pets and service animals arriving from the affected Central American nations. The USDA and CDC are collaborating to enforce these regulations, ensuring all animals meet specific health criteria before entry. These requirements are critical to safeguarding both animal and human health within the U.S.

The re-emergence of New World screwworm underscores the importance of ongoing surveillance and proactive public health measures to combat the spread of parasitic diseases. The situation remains fluid, and continued vigilance is essential to protect both travelers and domestic animal populations.

Reader question:-What factors might be contributing to the resurgence of New World screwworm after decades of eradication efforts?

Why, Who, what, and How did it end?

Why: The New World screwworm is resurging due to a complex interplay of factors, including potential gaps in surveillance, climate change impacting fly habitats, and decreased use of sterile fly release programs in some areas.

Who: The disease affects warm-blooded animals, including livestock (cattle, sheep, goats, horses) and humans. Those at risk include travelers to affected Central American countries, people working with livestock, and potentially, domestic animal populations in the U.S. if the disease spreads. The USDA and CDC are key organizations responding to the outbreak.

What: new World screwworm (NWS) myiasis is a parasitic disease caused by the larvae of the screwworm fly. The larvae infest living tissue, causing painful wounds, secondary infections, and potentially death. the resurgence involves cases reappearing