Influenza Update N° 510

Overview

^{Published 23 January 2025 | For reporting Week 2, ending 12 January 2025}

Influenza

• In the Northern hemisphere, influenza activity was elevated and increased in many parts of Europe (mostly A(H1N1)pdm09 detected) and Asia (mostly A(H1N1)pdm09). Activity was also elevated in North America (mostly A(H1N1)pdm09 and A(H3N2)), Central America and the Caribbean (mostly A(H3N2)), Western Africa (mostly B viruses), and Northern Africa (mostly A(H3N2)). Countries in Northern and Eastern Europe and Central Asia reported decreased activity.
• In the Southern hemisphere, influenza activity was elevated in a few countries in Tropical South America (A(H3N2) and B viruses co-dominantly circulating), Eastern Africa (mostly B viruses), and Melanesia (mostly A(H1N1)pdm09). Increased activity was reported from single countries in Eastern and Southern Africa but activity was similar or declined in all other reporting countries.

 

SARS-CoV-2

• SARS-CoV-2 activity was elevated in parts of South America, Southern Africa, and in South West Europe. Increased activity was reported from single countries in Central America and in Southern Asia but was similar or declined in all other reporting countries.

WHO encourages countries, especially those that have received the multiplex influenza and SARS-CoV-2 reagent kits from GISRS, to conduct integrated surveillance of influenza and SARS-CoV-2 and report epidemiological and laboratory information in a timely manner to established regional and global platforms. The guidance can be found here https://www.who.int/publications/i/item/WHO-2019-nCoV-integrated_sentinel_surveillance-2022.1.
 

Starting with report #501, the Global Respiratory Virus Activity Weekly Update included data from sentinel surveillance and other types of systematically conducted virologic surveillance. Countries, areas, and territories use a variety of approaches to monitor respiratory virus activity and data in this report may vary from surveillance reports posted elsewhere. Analyses stratified by source of surveillance is available through Respimart.