Weekly update, Influenza Epidemiological Week EW 38 (6 October 2022)

North America: Influenza activity remained low in the subregion, with the circulation of influenza A(H1N1)pdm09, influenza B (lineage undetermined), and the predominance of influenza A(H3N2). SARS‑CoV‑2 activity continued to decrease. In Canada, influenza was at interseasonal levels, while SARS‑CoV‑2 cases increased among those aged 60 and older. In Mexico, influenza activity remained increased at low-intensity levels and declined SARS-CoV-2 activity. In the United States, influenza activity was at interseasonal levels, while SARS-CoV-2 activity continued to decrease.

Caribbean: Influenza activity remained low, with the influenza A(H3N2) virus predominance. Saint Lucia reported increased SARS-CoV-2 activity, while RSV activity continued elevated in the Dominican Republic.

Central America: Influenza activity remained at baseline levels, predominating influenza A(H3N2). In Guatemala, influenza activity increased, predominating influenza A(H3N2). In Costa Rica and Honduras, SARS-CoV-2 activity continues elevated, but decreasing. In Nicaragua and Panama, RSV activity continues to increase.

Andean Countries: Influenza activity remained low, with influenza A(H3N2) predominance. Colombia and Peru reported SARS-CoV-2 at low activity levels.

Brazil and Southern Cone: The influenza activity remained low but with an upwards trend due to the increase observed in Argentina, where a moderate activity was detected, and Brazil, where the activity although increasing remained low. Influenza A(H3N2) was predominant with additional detections of influenza A(H1N1)pdm09, influenza B (lineage undetermined). .The SARS‑CoV-2 activity was low throughout the subregion. Increased RSV activity was reported in Brazil and Uruguay.