^{Published 18 June 2025 | For reporting Week 23, ending 08 June 2025}

Influenza

• In the Southern hemisphere, influenza positivity continued to increase and was moderate to high (above 20%) in a few countries of Temperate South America (predominantly A(H1N1)pdm09). Influenza positivity was elevated (>10%) in countries of Tropical and Temperate South America (predominantly A(H1N1)pdm09), Southern Africa (predominantly A(H3N2)), Eastern Africa (predominantly A(H3N2)), South-East Asia (predominantly A(H3N2)) and Oceania (predominantly A(H1N1)pdm09).
• In the Northern hemisphere, influenza activity remained stable or continued to decline in most countries with increases reported from a single country in Western Africa. Influenza positivity remained elevated in Central America and the Caribbean, Tropical South America and Western Africa (predominantly A(H1N1)pdm09), and Western, Southern and South-East Asia (predominantly A(H3N2)).

SARS-CoV-2

• Globally, SARS-CoV-2 positivity remained stable and low across the majority of reporting countries. Positivity was elevated (>10%) in a few countries in Central America and the Caribbean, Tropical South America, Northern and South-West Europe and in Asia, with minor increases in activity reported in some countries.

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.