Genetically Modified Flies Released to Combat Flesh-Eating Parasite

Jul 25, 2026

75 min

Jul 25, 2026 15:31

Scientists release genetically modified flies to stop flesh-eating parasite

## Innovative Approach to Pest Control

Scientists in the United States are conducting field trials with genetically modified New World screwworm flies to combat a flesh-eating parasite that poses a threat to livestock, wildlife, and occasionally humans. This parasite, known as Cochliomyia hominivorax, lays eggs in open wounds of warm-blooded animals, leading to severe tissue damage.

## Genetic Engineering Enhances Traditional Methods

Traditionally, the Sterile Insect Technique (SIT) has been used to control these pests by releasing sterilized male flies that mate with wild females, resulting in no offspring. The new approach involves genetically modifying male flies so that female offspring die before reaching maturity, while males continue to spread the trait. This could significantly reduce the number of flies needed for release, making eradication efforts more efficient and cost-effective.

## Concerns Over Potential Spread

Although the parasite was eradicated in the U.S. during the 1960s, recent outbreaks in Central America have raised concerns about its potential spread northward. A resurgence could impact livestock production and increase veterinary costs. The pest affects not only cattle but also other mammals like deer and dogs, with occasional human cases reported in endemic areas.

## Ongoing Evaluation and Future Prospects

The genetically modified flies are still under regulatory review and field testing. Any future releases would be gradual, complementing existing sterile insect programs. If successful, this could become one of the largest applications of genetic engineering in pest control, offering a new method to manage agricultural pests without heavy pesticide use.

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