Influenza Update N° 530

Overview

^{Published 11 June 2025 | For reporting Week 22, ending 01 June 2025}

Influenza

• In the Southern hemisphere, influenza activity remained stable in most countries with increases reported in single countries in Temperate South America and Oceania. Influenza positivity was elevated (>10%) in Tropical and Temperate South America (predominantly A(H1N1)pdm09), Southern Africa (predominantly A(H3N2)), Eastern Africa (predominantly A(H1N1)pdm09), South-East Asia (predominantly A(H3N2)) and Oceania (predominantly A(H1N1)pdm09). Positivity was over 30% in a few countries, as shown on the map below.
• In the Northern hemisphere, influenza activity continued to decline or remained stable in most countries with increases reported in a few countries in Central America and the Caribbean. Influenza positivity remained elevated in Central America and the Caribbean (predominantly A(H1N1)pdm09), Tropical South America, Western Africa (predominantly A(H1N1)pdm09), Western and Southern Asia (predominantly A(H3N2) and B viruses) and South-East Asia (predominantly A(H3N2)).

 

SARS-CoV-2

• Globally, SARS-CoV-2 positivity remained stable across the majority of reporting countries with elevated positivity and increases reported in a few countries in Central America and the Caribbean, Tropical South America, Western, Southern and South-East Asia. Positivity also remained elevated in South West Europe.

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://covid.comesa.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.