Weekly updates, Influenza Epidemiological Week EW 43 (10 November 2022)

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

Caribbean: Influenza activity remained low across the subregion with A(H3N2) virus predominance. Influenza activity is increasing in Jamaica and Puerto Rico. The SARS-CoV-2 activity was raised in Dominica.

Central America: Influenza activity remained low but increased with influenza A(H3N2) predominance and the co-circulation of influenza B (lineage undetermined). SARS-CoV-2 activity remained low in the subregion overall. Influenza activity increased in Guatemala with A(H3N2) predominance, and in Nicaragua increased with the circulation of influenza B (lineage undetermined). RSV activity is increased in Costa Rica and El Salvador.

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. However, Bolivia reported increased influenza activity with co-circulation of A(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.