A disease that had been eliminated is back, and no one knows how to stop it
For the first time in three decades, screwworm disease has returned to Honduras with fatal consequence — three lives lost in 2026, the latest an 85-year-old woman from Olancho, among 176 infections recorded in just five months. The Cochliomyia hominivorax fly, whose larvae consume living tissue, had been absent from human populations since 1995, making its resurgence a reminder that the boundaries between eliminated and merely dormant are never as permanent as we hope. What was once a solved problem has become an accelerating crisis, pressing health authorities to confront both the fragility of the elderly and the limits of collective memory in public health.
- A disease absent from Honduras for thirty years has returned with alarming speed, killing three people and infecting 176 in under five months — a pace that already exceeds half the country's entire 2025 caseload.
- The screwworm fly targets open wounds on living hosts, and the elderly are especially exposed: slower to notice small cuts, slower to heal, and less able to fight infection once larvae begin feeding on tissue.
- Approximately 5,000 livestock cases compound the crisis, as infected animals become mobile reservoirs from which flies can spread to other animals and to people nearby.
- Health officials are urging immediate wound coverage with protective gauze and close monitoring of elderly relatives, but containment has proven elusive since the government first declared an emergency in September 2024.
- The outbreak is landing in a place of deep uncertainty — authorities can name the threat and describe its spread, but no clear endpoint is yet in sight.
Honduras confirmed its third human death from screwworm infection this week — an 85-year-old woman from the northeastern department of Olancho, who died at Hospital Escuela in Tegucigalpa. Homer Mejía, head of the health ministry's surveillance unit, delivered the announcement on May 26th. The two earlier victims were a 77-year-old man and a 74-year-old woman, both from the capital.
The deaths are the sharpest measure of the outbreak, but not the only one. Honduras has recorded 176 human infections through May — already more than half the 300 cases documented across all of 2025, with seven months still remaining in the year. The speed of transmission has alarmed health authorities.
The cause is Cochliomyia hominivorax, the screwworm fly, which deposits eggs in open wounds on warm-blooded hosts. Larvae hatch within hours and begin consuming living tissue. The elderly are particularly vulnerable: small wounds go unnoticed, and weakened immune systems struggle to contain infection once it takes hold.
What deepens the alarm is that Honduras had been free of human screwworm cases since 1995. The disease's return — first signaled by a government health emergency in September 2024 — caught the region unprepared. The animal toll mirrors the human one: roughly 5,000 livestock cases have been documented, with cattle most affected, each representing both economic loss and a potential source of further spread.
Mejía has urged the public to cover any open wound immediately with protective gauze and to monitor elderly family members closely. But beneath the practical guidance lies a harder truth: a disease eliminated from human populations for a generation has come back, and how to stop it remains an open question.
Honduras marked a grim milestone this week when health officials confirmed the third death from screwworm infection in 2026—an 85-year-old woman from the northeastern department of Olancho who died at the Hospital Escuela in Tegucigalpa. The announcement came from Homer Mejía, head of the surveillance unit at Honduras's health ministry, who delivered the news to reporters on May 26th with the measured tone of someone watching a public health crisis accelerate.
The two deaths that preceded this one were a 77-year-old man and a 74-year-old woman, both living in the capital. Three people dead in five months. But the deaths, while the most visible measure of the outbreak, tell only part of the story. Through May, Honduras had recorded 176 human infections from the parasitic disease—a number that has alarmed the country's health authorities because it suggests the outbreak is moving faster than anyone anticipated. During all of 2025, the entire nation saw 300 cases. This year is already at more than half that total with seven months still remaining.
The culprit is a fly called Cochliomyia hominivorax, commonly known as the screwworm fly. The insect deposits its eggs in open wounds or lesions on warm-blooded animals, including humans. Within hours of the eggs being laid, larvae hatch and begin feeding on living tissue. The damage is immediate and severe. In livestock, the infection causes death, reduced milk production, and diminished meat yields. In people, particularly the elderly, it can be fatal.
What makes this outbreak especially troubling is that Honduras had not seen human cases of screwworm disease since 1995. The country had been free of it for three decades. Then, in September 2024, the government declared a health emergency as the disease began spreading across Central America and beyond. The reemergence caught the region off guard, and the pace of transmission has only quickened.
Mejía urged the public to take precautions, especially when caring for elderly relatives. Any open wound, no matter how small, should be covered immediately with protective gauze to prevent the fly from laying eggs. The elderly, he emphasized, need close monitoring. They are more likely to have cuts and sores that go unnoticed, and their immune systems are less equipped to fight off infection once it takes hold.
The animal side of the crisis is equally severe. Honduras has documented approximately 5,000 cases of screwworm infection in livestock, with cattle bearing the heaviest burden. The National Service for Agricultural Health and Food Safety has been tracking the spread, but containment has proven difficult. Each infected animal represents both an economic loss and a potential source of new infections, since the flies can travel and lay eggs in other animals or in people who come into contact with them.
The convergence of human deaths, rising case numbers, and widespread animal infection has created a situation that demands urgent response. Health officials are asking citizens to remain vigilant, to protect wounds, to watch over vulnerable family members. But beneath the public health messaging lies a deeper anxiety: a disease that had been eliminated from human populations for a generation has returned, and no one yet knows how to stop it.
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Health officials urged the public to cover any open wound immediately with protective gauze and to monitor elderly relatives closely for signs of infection.— Homer Mejía, head of surveillance unit, Honduras health ministry
A Conversa do Hearth Outra perspectiva sobre a história
Why is this outbreak happening now, after thirty years without a single human case?
The disease never really left the region—it was always in wildlife and livestock in other countries. Something changed in the epidemiology, maybe climate, maybe trade patterns, maybe the fly's range expanded. But Honduras was protected by distance and luck. That protection is gone.
The numbers are striking—176 cases in five months versus 300 for the entire year before. Is that acceleration or just better detection?
Probably both. But even if we're catching more cases now, the fact that we're catching them at all means the fly is establishing itself in places it wasn't before. Better detection is good. But it also means the problem is real and spreading.
Why are the elderly so vulnerable?
Open wounds heal slower in older people. They might not notice a small cut or sore. And their immune systems are weaker, so once the larvae start feeding, the infection progresses faster. A young person might get infected and recover with treatment. An 85-year-old can die from it.
The livestock numbers—5,000 cases—seem almost secondary to the human deaths, but economically they might be the bigger threat.
They are. A dead cow is a direct loss. Reduced milk production affects entire communities. But the livestock also become a reservoir. Every infected animal is a place where the fly can breed and multiply. You can't separate the human crisis from the animal crisis.
What does "declare a health emergency" actually do?
It mobilizes resources, allows the government to move faster, to coordinate across agencies. But it's also an admission that normal procedures aren't enough. It signals that this is beyond routine management.