Our study found a high prevalence of Salmonella in retail meats and persons with enteric infection; many of these isolates were resistant to clinically important antimicrobials. A random selection of isolates from people and retail meat showed genetic relatedness, which suggests that, in Yucatan, considerable transfer of Salmonella occurs through the food chain.

The rapid and widespread dissemination of MDR blaCMY-2 Salmonella Typhimurium in Mexico calls for urgent interventions to contain this potentially fatal pathogen.