This issue of the ECDC Communicable Disease Threats Report (CDTR) covers the period 15-22 October 2023 and includes updates on respiratory virus epidemiology in the EU/EEA, SARS-CoV-2 variant classification, cryptosporidiosis, dengue, West Nile virus, and mass gathering monitoring for the Rugby World Cup.
Compared with the 2021‑2022 influenza season, for sentinel surveillance the number of tested specimens has
doubled, with a 4‑fold increase in influenza detections.