Is flu going around in Poland?

Flu season in Poland runs through the cold half of the year, with meaningful activity usually building from December onward. Peaks tend to arrive slightly later than in the DACH region, most often between January and March. The exact timing shifts year to year depending on the dominant influenza subtype and residual immunity. Polish surveillance bulletins treat the winter trough of January–March as the core window where primary-care load is highest.

Influenza surveillance in Poland is coordinated by NIZP PZH, the National Institute of Public Health (Państwowy Zakład Higieny), which operates the national SENTINEL and non-sentinel reporting networks. NIZP PZH publishes regular influenza bulletins combining clinical ILI reports from primary-care sites with virological confirmations from reference laboratories. Aggregated indicators then feed into ECDC's ERVISS platform at the European level, where Poland's signal can be compared directly with other EU/EEA countries.

Polish weekly indicators are transmitted to the European Centre for Disease Prevention and Control (ECDC) and published through ERVISS, the European Respiratory Virus Surveillance Summary. ERVISS harmonises country-level signals (ILI/ARI consultation rates, positivity, and subtype distribution) so that Poland's trajectory can be read alongside neighbours like Germany, Czechia, and the Baltic states. This means Polish flu activity is visible in both NIZP PZH's national bulletins and ECDC's pan-European dashboards.

The overall shape is similar, a winter wave driven by the same circulating influenza A and B strains, but Poland's peak typically lags the German one by a few weeks, and the late-winter tail (February–March) is often more prominent. Because both countries report into ERVISS, the relative timing of peaks is directly observable. In colder seasons with an eastward strain drift, Polish activity can remain elevated after German indicators have already started falling.

NIZP PZH and ECDC classify activity qualitatively rather than by absolute case counts, using tiers such as baseline, low, moderate, high, and very high. These tiers are derived from historical reference ranges for ILI/ARI consultation rates and laboratory positivity. The goal is to signal whether the current week's pressure is ordinary for the time of year or unusually intense, without implying precision the underlying sentinel data cannot support.