Four Human Myiasis Cases Confirmed in Querétaro, Mexico

The State Health Secretariat of Querétaro (SESA) has confirmed a total of four human cases of myiasis caused by the Cochliomyia hominivorax (screw-worm) fly in 2026. Two new cases were reported: a 73‑year‑old man from the municipality of Querétaro and an 85‑year‑old man from San Juan del Río, bringing the state’s tally to four.

SESA intensified epidemiological surveillance and response protocols after the first national case was identified, expanding monitoring to all medical units. The agency warned that the infestation, typically a livestock disease, can affect people with open wounds, especially older adults, diabetics, the immunocompromised, and those working near cattle. Symptoms include severe pain, inflammation, foul odor, discharge, bleeding, fever, and visible larvae. Authorities advise immediate medical care for non‑healing wounds and prohibit home removal attempts with contaminated objects or chemicals.

Permanent surveillance and coordination with animal health authorities will continue throughout the rainy season to limit further transmission.