Screwworm infection in domestic and wild animals
As of May 14, 2025, Mexico registered 9 confirmed cases of domestic dogs infected by the livestock screwworm (GBG), according to data from the World Animal Health Information System (Wahis), dependent on the World Organization for Animal Health (WHO). This parasite, scientifically known as Cochliomyia hominivorax, mainly affects cattle, but its presence in canines represents an atypical epidemiological event that requires exhaustive analysis.
The report details that, since February 2025, 10 susceptible cases have been identified, including four recent exposures. In addition to dogs, infections were documented in other species: 278 cattle, 38 equids (horses and donkeys), 2 goats, 3 sheep, 85 pigs and a hawk. Only one bovine died; the rest received treatment without the need for sacrifice. All cases were confirmed by parasitological tests carried out by the National Reference Center in Animal Parasitology (CENAPA).
Context and associated risks
GBG is a larva that feeds on living tissue, causing serious injury and even death if untreated. Its appearance in pets suggests a possible geographic expansion or changes in transmission vectors. Experts point out that the increase in temperatures and animal mobility could influence this phenomenon.
Suspension of poultry imports from Brazil
In parallel, the Secretary of Agriculture and Rural Development (SADER) announced the precautionary suspension of imports of Brazilian poultry products, after confirming an outbreak of H5N1 avian influenza in that country. The measure, communicated on May 15, affects chicken meat, fertile eggs, live birds and derivatives for human consumption or pets.
The decision is based on international protocols to prevent the entry of highly pathogenic viruses, which could compromise national poultry production. Brazil, one of the world’s largest exporters, notified the case through the Ministry of Agriculture (MAPA), activating coordinated responses with the Mexican Senasica.
Economic impact and control measures
This temporary suspension could affect supply chains, although authorities assure there are sufficient inventories. Controls at customs were reinforced and national farms are monitored to detect early symptoms. The WHOA recommends quarantine and PCR testing on birds imported from regions with active outbreaks.
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