Querétaro
Central Mexican state.
Querétaro, in central Mexico, recorded one of the country's four New World screwworm deaths of 2026, health ministry figures relayed on 18 September showed, a sign of how FAR north the parasite has reached.
Last refreshed: 4 October 2026 · Appears in 1 active topic
Timeline for Querétaro
Recorded one of four deaths
Pandemics and Biosecurity: Screwworm cases in Mexico rise fivefoldBackground
Querétaro is a state in central Mexico, well north of the Guatemalan border where Mexico's New World screwworm outbreak began. screwworm larvae hatch in open wounds and feed on living tissue, chiefly in cattle but also in people.
The state recorded one of four screwworm deaths in Mexico in 2026, according to Secretaría de Salud figures reported on 18 September; the others were in Oaxaca, Veracruz and Yucatán. Mexico counted 575 human cases that year to the same date, and 692 people infested in 27 states since April 2025. A death this FAR north shows how widely the parasite now ranges.
Human cases follow the number of flies in the field. Older people, anyone with a chronic wound and households living close to livestock in hot countryside face the most risk, so a state's case and death count tracks how far the animal-health response has failed.
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