Public Health Alert: Flesh-Eating Screwworm Found In U.S. Resident

James

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Post on Aug 29, 2025

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Public Health Alert: Flesh-Eating Screwworm Found in U.S. Resident Sparks Concerns

A rare case of human myiasis caused by the flesh-eating screwworm (Cochliomyia hominivorax) has been confirmed in a U.S. resident, triggering a public health alert and raising concerns about the potential spread of this invasive parasite. The discovery underscores the importance of preventative measures and rapid diagnosis in dealing with this dangerous insect.

The Centers for Disease Control and Prevention (CDC) is working alongside state health officials to investigate the incident and determine the source of the infection. While screwworm infestations are relatively uncommon in the United States, this case serves as a stark reminder of the potential health risks associated with these parasitic flies.

Understanding the Threat: What is a Screwworm?

The New World screwworm, Cochliomyia hominivorax, is a parasitic fly whose larvae feed on living tissue. This process, known as myiasis, can cause significant pain, infection, and even death if left untreated. The larvae burrow into the skin, creating open wounds that can become severely infected. Symptoms can include:

• Pain and swelling at the site of infestation.
• Presence of maggots in the wound.
• Fever and chills.
• Localized infection.
• Severe tissue damage.

Unlike many other fly larvae, screwworm larvae actively feed on living tissue, making them particularly dangerous. This sets them apart from other types of myiasis-causing flies that might feed on dead or decaying tissue.

How the Infestation Occurs and Prevention

Screwworms typically infest open wounds, cuts, or sores. They lay their eggs near these openings, and the hatched larvae then burrow into the flesh. Preventing infestation involves:

• Prompt treatment of any open wounds or sores.
• Keeping wounds clean and covered.
• Using insect repellent, especially in areas where screwworms are known to be present.
• Regularly checking livestock for signs of infestation (as screwworms primarily affect livestock).

While this case involves a U.S. resident, the screwworm is more commonly found in warmer climates and is a significant threat to livestock. The CDC emphasizes the importance of early detection and treatment to minimize the risk of severe complications.

Public Health Response and Ongoing Investigation

The CDC is actively investigating the circumstances surrounding this particular case, including the potential source of the infestation and any potential further spread. This investigation includes tracing the patient's recent travel history and contacts. While the risk to the general public remains low, the agency is urging individuals to remain vigilant and seek medical attention if they suspect a screwworm infestation.

Further information on screwworms and myiasis can be found on the CDC website and other reputable public health resources.

This rare case highlights the need for continued surveillance and preparedness to manage potential outbreaks of this dangerous parasite. The timely identification and treatment of any suspicious wounds are crucial to preventing severe complications.

Call to Action: If you experience any symptoms consistent with a screwworm infestation, seek immediate medical attention. Do not attempt to remove the larvae yourself.