Weekly updates, Influenza Epidemiological Week 18 (12 May 2023)

Download from the PAHO Digital Library	North America: Influenza activity has remained at low levels. During the last 4 EW, the predominant influenza viruses have been B/Victoria, with also circulation of influenza A (mostly A(H1N1)pdm09) at a lesser extent. Respiratory Syncytial Virus (RSV) activity has remained at low level. SARS-CoV-2 activity has decreased however it continues circulating at high levels. Caribbean: Influenza activity has shown a rise in recent weeks with medium levels of activity. During the last 4 EW, the predominant influenza viruses have been B/Victoria, with less circulation of influenza A (mostly A(H1N1)pdm09). RSV activity has remained low. SARSCoV-2 activity has shown a decrease and is currently at low levels of circulation. Central America: Influenza activity has shown medium levels of circulation, with a sharp decrease in recent weeks. During the last 4 EW, the predominant influenza viruses have been A, mostly A(H1N1)pdm09, with less circulation of influenza B /Victoria. RSV activity has remained low. SARS-CoV-2 activity has remained low and has decreased in recent weeks. Andean: Influenza activity has shown an increase in the number of detections while remaining stable at low levels of positivity. During the last 4 EW, the predominant influenza viruses have been A, mostly A(H1N1)pdm09, with less circulation of influenza B (Victoria). RSV activity remained at medium levels of circulation. SARS-CoV-2 activity has shown an increase and is currently circulating at medium levels. Brazil and Southern Cone: Influenza activity has shown a pronounced increase with high levels of circulation. During the last 4 EW, the predominant influenza viruses have been A, mostly A(H1N1)pdm09, with co-circulation of influenza B/Victoria. RSV activity, after showing an increase in recent weeks a decreasing trend has been observed. SARS-CoV-2 activity has remained at low levels. Global: Available at: Global Influenza Programme (who.int) Avian Influenza: A summary of the avian influenza situation in the region, case management and recommendations are available at Epidemiological alerts and updates \| PAHO/WHO \| Pan American Health Organization (paho.org).