Flu season 2026/27: activity in 24 countries
This page tracks the 2026/27 flu season across 24 countries. It is recalculated every week, as soon as the national surveillance bodies publish: RKI for Germany, CDC for the United States, UKHSA for the United Kingdom, ECDC ERVISS for the rest of Europe and WHO FluNet for Asia. Every country is classified qualitatively as low, moderate or high.
21 countries low
3 moderate · 3 rising
Season 2026/27 · Week 36 / 2026 · 24 of 24 countries reporting
Data window: Week 36 · Aug 31 – Sep 6 · Source: RKI, CDC, UKHSA, ECDC ERVISS, WHO FluNet (weekly)
The 2026/27 season starts with ISO week 40. Until then this page shows the last reported values of the current inter-season period, and many European sources do not publish over the summer at all.
Flu activity by country, 2026/27 season
| Country | Influenza | vs prior week |
|---|---|---|
| Germany | Low | falling |
| United States | Low | rising |
| United Kingdom | Low | unchanged |
| France | Low | falling |
| Spain | Low | falling |
| Italy | Low | unchanged |
| Netherlands | Low | unchanged |
| Poland | Low | unchanged |
| Sweden | Low | unchanged |
| Austria | Low | falling |
| Belgium | Moderate | rising |
| Denmark | Low | falling |
| Ireland | Low | unchanged |
| Portugal | Low | unchanged |
| Finland | Low | unchanged |
| Norway | Low | unchanged |
| Czechia | Low | falling |
| Hungary | Low | falling |
| Romania | Low | falling |
| Greece | Low | unchanged |
| Iceland | Low | unchanged |
| Japan | Low | falling |
| India | Moderate | unchanged |
| China | Moderate | rising |
When this page changes
Most sources publish once a week, RKI on Thursdays. Each country page carries its own data window in the “this week” block at the top; this overview follows the same cadence.