Cochliomyia hominivorax: the man-eating larvae

2025-07-11 Gallura Disinfestazioni posted:

There has recently been talk of the return, especially in Central America, of the plague of Cochliomyia hominivorax, the man-eating larvae that infest livestock and devour their flesh until they die.

The situation is so serious that the Trump administration has suspended the importation of cattle from Mexico.

What is Cochliomyia hominivorax?

Cochliomyia hominivorax is a species of fly belonging to the Calliphoridae family. It is known for its larvae that develop in the wounds of mammals, including humans and domestic and farm animals.

Why is it important?

This fly is considered an important parasite because it can cause serious infections and significant damage to affected animals.

Where is it found?

Originally, this fly was mainly present in the Americas, especially in Central and South America.

How is it transmitted?

The larvae of this fly develop in open wounds of animals or people.

Mode of transmission:

• Females lay eggs directly on wounds or areas of broken skin.
• The larvae, once hatched, feed on infected tissue, causing infections and complications.

What are the symptoms?

Infected animals show:

• Open wounds with visible larvae
• Localized infections and inflammation
• Weight loss and weakness
• Sometimes fever and general discomfort
• Tissue damage and necrosis

Why is it important to intervene?

If left untreated, screwworm infestation can lead to:

• Severe infections
• Tissue loss
• In severe cases, death of the animal

Prevention and timely treatment are essential to protect animal welfare and limit spread.

How can it be prevented and controlled?

Here are some key strategies:

• Monitoring and controlling insect vectors
• Disinfestation and use of repellents and fly traps
• Care and thorough cleaning of wounds and lesion areas
• Vaccinations and antiparasitic treatments in at-risk areas
• Isolation of infected animals to prevent spread

Fun fact

To combat it, Panama has a program in place to sterilize the “killer flies” that lay larvae. Panamanian scientists produce and release infertile males to limit its spread.