Mexico — The Mexican Ministry of Health has issued a new epidemiological bulletin covering June 15 to 21, 2025, revealing that since the initial alert in 2024, the country has recorded at least 26 confirmed human cases of the parasitic screwworm. The larvae, described as cylindrical in shape with protruding ring-like spines resembling a screw, are whitish in color.
How the Screwworm Spreads in Mexico
Infestation occurs when a fly deposits its eggs in a superficial wound on a mammal. Within 12 to 24 hours, the larvae hatch and feed on living tissue for 4 to 8 days. Once fully developed, they fall to the ground to pupate, emerging as adult flies 7 to 10 days later.
In humans, myiasis caused by the Cochliomyia hominivorax larvae manifests as an enlarging, deepening wound accompanied by pain, redness, inflammation, and foul-smelling pus or bloody discharge. Untreated cases may lead to secondary infections, fever, chills, and tissue damage.
Prevention and Symptoms
To prevent infestation, health authorities emphasize maintaining personal and animal hygiene, avoiding contact with open wounds or infested animals, and promptly treating injuries to deter egg-laying by flies. Recommendations include using insect repellent, protective clothing, and installing window and bed netting.
States With the Highest Cases
The bulletin included a map highlighting the most affected regions, though specific state names were not detailed in the provided text. Authorities urge vigilance and adherence to preventive measures to curb further spread.
The Ministry of Health continues to monitor the situation and advises immediate medical attention for suspected cases.
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