Weekly updates, Influenza Epidemiological Week EW 44 (11 November 2022)

Download from the PAHO Digital Library	North America: Influenza activity is moderate in the subregion, with the predominance of influenza A(H3N2) and co-circulation of influenza A(H1N1)pdm09 and influenza B (lineage undetermined). The SARS-CoV-2 activity was low, while RSV activity remained elevated. In Canada, influenza activity is increasing. In Mexico, influenza was at moderate-intensity levels. Increased influenza activity was reported in the United States. Caribbean: Influenza activity remained low across the subregion with A(H3N2) virus predominance and co-circulation of influenza B (lineage undetermined). The SARS-CoV-2 activity was very low. Influenza activity is increasing in Jamaica and Puerto Rico. ILI activity remained elevated in Guadeloupe and Martinique. Central America: Influenza activity remained low but increased with the predominance of influenza A(H3N2) and the 6 co-circulation of influenza B (lineage undetermined). SARS-CoV-2 activity remained low in the subregion. Guatemala and Nicaragua reported increased influenza activity with A(H3N2) predominance in the first and influenza B (lineage undetermined) in the latter. In addition, RSV activity increased in El Salvador and Guatemala. Andean: Influenza activity remained low, with the predominance of influenza A(H3N2) and co-circulation of influenza A(H1N1)pdm09 and B (lineage undetermined). Overall, SARS-CoV-2 and RSV activity was low in the subregion. Bolivia reported increased influenza activity with co-circulation of A(H3N2) and A(H1N1)pdm09. 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. Argentina reported increased influenza activity with B (lineage undetermined) virus predominance, while Chile reported increased influenza activity for this time of year at high-intensity levels; ILI was increased with 35% ILI cases positive for influenza and 2.7% for SARS-CoV-2. In addition, RSV activity increased in Brazil.