Regional Update, Influenza and Other Respiratory Viruses. Epidemiological Week 42 (30 October 2026)

Regional Situation: Respiratory virus activity remained heterogeneous across the Americas. Influenza positivity was markedly higher in the Caribbean than in EW 39, with higher values also reported in Central America and the Andean subregion, while lower positivity was observed in Brazil and the Southern Cone. Influenza B predominated in North America, the Andean subregion, and Brazil and the Southern Cone. RSV positivity remained especially elevated in Central America, notably Panama, and was also higher in the Caribbean than in EW 39. SARS-CoV-2 positivity remained generally low across the Region.