Officials step up plans to combat flesh-eating screwworm

Texas officials are stepping up their plans to stop the spread of a flesh-eating parasite, [Reuters reports](https://www.reuters.com/world/us/usda-plans-sterile-fly-facility-texas-combat-screwworm-2025-06-18/).
The parasite, known as the New World screwworm (Cochliomyia hominivorax), has triggered a public health emergency in Costa Rica, prompting experts to warn Canadian travellers to take precautions.
State-side, Texas officials said Wednesday they are building a sterile fly dispersal facility. The Department of Agriculture also announced plans for a sterile fly production facility at Moore Air Base, which could take two to three years to construct.
New World screwworm (NWS) was eradicated from the U.S. in 1966, but the current health emergencies in central America and Mexico have seen the parasite moving northward.
On its website, the U.S. Department of Agriculture's Animal and Plant Health Inspection Service (APHIS) says it has been partnering with other USDA agencies, including the U.S. Department of State, the Food and Agriculture Organization of the United Nations, and affected countries to combat the outbreak.
"APHIS is investing $109.8 million to combat new NWS detections in Central America and Mexico to keep the pest from spreading into North America," the agency's website reads.
"With this funding, APHIS aims to eradicate NWS in Central America and Mexico and re-establish the biological barrier."
On Wednesday, U.S. Agriculture Secretary Brooke Rollins said the USDA is also working with state animal health officials to draft an emergency response and stockpile medications in case NWS breaches the border, according to Reuters.
In March, infectious disease specialist Dr. Issac Bogoch took to X to spread awareness and warn Canadians, especially those travelling to destinations like the Dominican Republic, Costa Rica, and Mexico.
"The "barrier" preventing New world screwworm flies (Cochliomyia hominivorax) from spreading north of Panama has been breached," The Toronto-based doctor said on social media.
"We recently cared for a patient who contracted this infestation on a trip to Costa Rica."
Despite what its name suggests, the New World screwworm is not a worm at all—it is a species of parasitic fly.
Female screwworm flies lay their eggs in open wounds, scrapes, or insect bites on people and animals. When the eggs hatch, the larvae burrow into the flesh, feeding on living tissue and potentially causing serious wounds, infections, and even death if left untreated.
Infections occur primarily in livestock but people can and do get infected, including an 80-year-old Canadian male traveller who went to a Toronto hospital with an NWS infection (also called myiasis) after visiting Costa Rica.
Speaking with CP24, Dr. Bogoch said NWS is a public health issue that can also impact food security.
'This infection can decimate wildlife and livestock,' he told the news outlet.
NWS is commonly found in Cuba, Haiti, the Dominican Republic, and South American countries but (APHIS) says cases are spreading to Costa Rica, Nicaragua, Honduras, Guatemala, Belize, El Salvador and Mexico, beyond a biological border that had previously contained the spread.
The agency says there has been an "explosion" in NWS detections in Panama. In 2023 cases went up from an average of 25 cases annually to more than 6,500 cases in one year.
(APHIS/USDA.gov)
APHIS and Panama co-managed the biological border that "successfully" contained the pest in South America for "decades," APHIS says on its website. The now-breached barrier resides in the eastern portion of Panama.
The outbreak declarations in Costa Rica and Mexico have triggered emergency responses in the United States, Mexico, and Costa Rica, which first declared an NWS emergency in February.
According to the U.S. Centers for Disease Control and Prevention, you can become infected if:
You travel to affected areas (like Costa Rica, Nicaragua, or Mexico);
You have open cuts, sores, or scratches;
You come into contact with livestock or wildlife carrying the parasite.
Canadian travellers can protect themselves by:
Covering any cuts or scratches with clean, dry bandages;
Using insect repellent, especially on exposed skin;
Wearing long sleeves and pants in rural areas or places with plants and trees;
Avoiding close contact with stray animals or livestock;
Consulting a travel health clinic and a medical professional before travelling.
There are no vaccines or medications that prevent infection.
If you suspect infection:
Seek medical attention immediately.
Do not attempt to remove larvae yourself.
Treatment usually involves the extraction of the larvae and prescription antibiotics.
The parasite typically needs warm conditions to survive and Canada's cooler climate acts as a natural barrier.
This parasite is not currently found in Canada, but with travel-related cases increasing and the barrier that once stopped its spread now breached, Canadians heading south should be on alert.
Always check travel health advisories and when in doubt, speak to a medical professional before travel.
Header image: File photo of new age screwworm larvae (CDC].

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