Since the end of November 2024, traces of polioviruses have been found in wastewater in several German cities, including Munich, Bonn, Cologne, Hamburg, and later in Dresden, Mainz, and Stuttgart. These are known as vaccine-derived polioviruses, which originally come from attenuated oral vaccines.

Fever is one of the most unsettling symptoms: How high is too high? Do I need to reduce the fever? When is it dangerous? The good news: The current S3 guideline on fever management has provided clear, scientifically sound guidance since 2025 .