Regional Update, Influenza and Other Respiratory Viruses. Epidemiological Week 38 (2 October 2026)

Regional Situation: Respiratory virus activity remained heterogeneous across the Americas. Influenza circulation continued to increase in Central America and the Andean subregion, while Brazil and the Southern Cone maintained a downward trend and reached interseasonal levels. In North America, influenza activity declined after a sharp increase over the preceding month, and remained relatively low in the Caribbean. RSV circulation was particularly elevated in Central America, while activity continued to decline in the Andean subregion and Brazil and the Southern Cone. SARS-CoV-2 circulation remained generally low across the Region, with relatively higher positivity in the Caribbean.