Weekly number of RSV detections in children in Switzerland January 2021–June 2024. a) Absolute numbers by age group. b) Scaled relative numbers for the 6 respiratory virus reporting regions in Switzerland. Scaling was done within each Sentinella region, ensuring that the maximum height of each curve corresponds to the maximal number of RSV detections over the whole study period in the respective region. GE, Geneva University Hospital; VD, Lausanne University Hospital; NE, Cantonal Hospital Neuchatel; VS, Valais Hospital and Hospital Riviera-Chablais; BE, University Hospital Bern and Children's Hospital Wildermeth, Biel; FR, Fribourg Hospital HFR; AG, Cantonal Hospital Aarau and Hospital Baden; BS, University Children's Hospital Basel; LU, Children's Hospital of Central Switzerland, Lucerne; SG, Children's Hospital of Eastern Switzerland; SH, Cantonal Hospital Muensterlingen; ZH, Cantonal Hospital Winterthur, University Children's Hospital Zurich and City Hospital Triemli, Zurich; GR, Cantonal Hospital of Graubuenden; TI, Institute of Pediatrics of Southern Switzerland (Bellinzona, Locarno, Lugano).