Regional Update, Influenza and Other Respiratory Viruses. Epidemiological Week 39 (9 October 2026)

Regional Situation: Respiratory virus activity remained heterogeneous across the Americas. Influenza circulation continued to decline in North America, remained low in the Caribbean, and increased gradually in Central America and the Andean subregion. In Brazil and the Southern Cone, activity stabilized after a sustained decline, with influenza B predominating in recent weeks. RSV activity remained substantial in Central America, particularly Panama, increased in the Caribbean, and reached high positivity in Uruguay, although it continued to decline at the subregional level in Brazil and the Southern Cone. SARS-CoV-2 circulation was generally low, declining in the Caribbean while showing a recent increase in North America.