Weekly update, Influenza Epidemiological Week EW 40 (19 October 2022)

North America: Influenza activity remained low throughout the subregion. Influenza A(H3N2) predominated with the co-circulation of influenza A(H1N1)pdm09 and influenza B/Victoria. SARS‑CoV‑2 activity continued to decrease overall. In Canada, influenza was at baseline levels. In Mexico, influenza activity increased at moderate-intensity levels. In the United States, an early increase in influenza activity was reported in some areas. Overall, in the subregion, RSV circulation continues to increase.

Caribbean: Influenza activity remained at baseline levels, predominating the influenza A(H3N2) virus circulation. In Saint Lucia and Haiti, SARS-CoV-2 activity continues elevated.

Central America: Influenza activity remained low, predominating influenza A(H3N2) with the co-circulation of influenza B (lineage undetermined). In Guatemala, influenza activity increased, predominating influenza A(H3N2), with the circulation of influenza B (lineage undetermined) in Nicaragua, at a low-intensity level. In addition, increased RSV activity was observed in Panama and Guatemala.

Andean Countries: Influenza activity remained low, with the predominance of influenza A(H3N2). Venezuela reported an increased influenza activity with circulation of influenza A(H3N2).

Brazil and Southern Cone: Influenza activity remained low in the subregion, although an increasing trend was observed in recent weeks, likely due to increased activity at moderate intensity levels in Argentina, Brazil, and Chile where the activity remained low. Influenza A(H3N2) was predominant, followed by influenza A(H1N1)pdm09 and influenza B (lineage undetermined) detections. The SARS-CoV-2 activity was low throughout the subregion. Increased RSV activity was reported in Brazil and Uruguay, where SARI activity continued above the average epidemic levels.