# Mexico myiasis fly outbreaks > Live situation record from CLSTR: https://clstr.news/situations/mexico-myiasis-fly-outbreaks > Updated: 2026-07-25T18:46:14.000Z. Sources: 6. Developments: 2. In late July 2026 Mexican health officials confirmed a third human case of botfly‑caused myiasis in Jalisco, involving a 70‑year‑old woman who recovered after prompt treatment. The same municipality reported the first confirmed botfly infection in cattle, prompting the establishment of a 20‑km sanitary fence and additional protocols to protect livestock, pets, and wildlife. The following day, veterinary experts issued preventative guidance for screwworm fly (Cochliomyia hominivorax) infestations in Yucatán. The advice emphasized regular livestock wound inspections, immediate cleaning and treatment of any injuries, and rapid reporting to zoosanitary authorities. The guidance highlighted that the screwworm fly, while primarily affecting cattle, can also infest other domestic and wild animals and, rarely, humans. Together, the reports illustrate a growing focus by Mexican authorities on monitoring and controlling myiasis‑causing flies across both human health and animal‑health sectors, implementing containment measures, and disseminating preventive information to producers and the public. ## Timeline ### 2026-07-25: Screwworm Fly Infestation Prevention Guidance Issued in Yucatán, Mexico Veterinary officials in Yucatán advise livestock owners to promptly inspect and treat animal wounds to prevent screwworm fly (Cochliomyia hominivorax) infestations that can affect cattle and other animals. 2 sources. https://clstr.news/cluster/screwworm-fly-infestation-prevention-guidance-issued-in-yucatn-mexico ### 2026-07-24: Mexico reports third human botfly case and first livestock infection Mexico reported its third human botfly myiasis case in Jalisco and the first livestock infection in Cuauhtémoc, prompting treatment of the patient and sanitary measures for cattle. 4 sources. https://clstr.news/cluster/mexico-reports-third-human-botfly-case-and-first-livestock-infection --- Cite as: Mexico myiasis fly outbreaks. CLSTR, https://clstr.news/situations/mexico-myiasis-fly-outbreaks