Weekly updates, Influenza Epidemiological Week EW 42 (28 October 2022)

North America: Influenza activity remained low, but it is increasing. Influenza A(H3N2) predominated with the co‑circulation of influenza A(H1N1)pdm09 and influenza B (lineage undetermined). The SARS‑CoV‑2 activity was low overall, and RSV circulation continued to rise in the subregion. In Canada, influenza was at baseline levels, while in Mexico, influenza activity continued to increase at moderate-intensity levels. In the United States, influenza activity increased, with H3N2 predominance and increased RSV activity.

Caribbean: Influenza activity remained low across the subregion, predominating the influenza A(H3N2) virus circulation. Influenza activity is increasing in Jamaica and Puerto Rico. SARS-CoV-2 remained increased in Haiti.

Central America: Influenza activity remained low, with influenza A(H3N2) predominance and the co-circulation of influenza B/Victoria. Influenza activity increased in Nicaragua with circulation of B (lineage undetermined). SARS-CoV-2 activity remained low in the subregion. In Panama, RSV activity continued elevated.

Andean: Influenza activity remained low, with the predominance of influenza A(H3N2) and co-circulation of influenza B/Victoria. Overall, SARS-CoV-2 and RSV activity was low in the subregion. Bolivia reported increasing influenza activity with co-circulation of H3N2 and B/Victoria.

Brazil and Southern Cone: Influenza activity increased in the subregion, with influenza A(H3N2) predominance and co-circulation of influenza A(H1N1)pdm09 and influenza B/Victoria. SARS-CoV-2 activity has remained low overall. Argentina, Chile, and Uruguay reported increased influenza activity, while RSV activity remains high in Brazil and Uruguay.