First Human Screwworm Death Reported in Mexico

Campeche, Mexico — Mexico’s Ministry of Health has confirmed the first human fatality linked to myiasis caused by the New World screwworm (Cochliomyia hominivorax). The victim, an 86-year-old woman with a preexisting diagnosis of skin cancer, succumbed to complications arising from the parasitic infestation.

Details of the Case

According to the National Epidemiological Bulletin, the woman, a resident of Candelaria Municipality, was hospitalized in May due to skin lesions caused by the screwworm larvae. After receiving treatment, she was discharged but later readmitted in critical condition.

The official report states that her death was attributed to squamous cell carcinoma, a form of skin cancer, compounded by underlying health issues including impaired consciousness, skin ulcers, and systemic hypertension.

Additional Cases and Outbreak Scope

Health authorities in Campeche have documented two additional human cases of screwworm-related myiasis. The outbreak extends beyond human infections, with 277 cases reported in livestock across multiple municipalities, including Candelaria, Calakmul (which borders Belize and Guatemala), Carmen, Champotón, Palizada, Campeche, and Hopelchén.

Background on Screwworm Infestations

The New World screwworm is a parasitic fly whose larvae infest open wounds in warm-blooded animals, including humans. While rare in humans, infestations can lead to severe tissue damage and secondary infections, particularly in immunocompromised individuals.

The incident marks the first recorded human death in Mexico directly associated with screwworm myiasis, raising concerns about the parasite’s spread and its potential impact on public health and agriculture.