Regional Update, Influenza. Epidemiological Week 43 (4 November 2022)

ABSTRACT

[WEEKLY SUMMARY]. 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.