Overview
- Argentina confirmed a PCR-positive measles case in a two-year-old from Santa Elena, Entre Ríos, who is clinically stable and isolating at home under pediatric follow-up.
- The national health ministry reissued a countrywide alert and launched contact tracing tied to the child's mid-November visit to Casilda, while Santa Fe deployed block vaccination and active case finding.
- Baja California reported five cases in a single family in the Valle de Mexicali and opened a weekend macro vaccination site at the FEX, with about 100,000 state doses available and rural brigades going house to house.
- Mexico City raised its tally to 12 cases after confirming five more and will install six vaccination modules for pilgrims along the route to the Basílica de Guadalupe starting December 10, with more than 260,000 doses on hand.
- Mexico’s national report listed 5,504 cumulative cases as of December 4, and health agencies across the Americas cite a regional measles resurgence driven by immunity gaps and travel-linked transmission.