2025 Yes https://doi.org/10.3390/v17040477 Sachse, Sven Europe Experimental Observational Students Staff Elementary (K-5) Middle/Jr High (6-8) High School (9-12) Viruses COVID rates SARS-CoV-2 Outbreak investigation Wastewater Researchers used wastewater and sequencing to detect SARS-CoV-2 B.1.640.2 before diagnosis in a German high school outbreak. Contact tracing confirmed spread across institutions, highlighting wastewater’s value for early variant detection.