Swiss health authorities reported the flu epidemic started earlier than last year and lab-confirmed influenza cases have nearly doubled compared with the prior year. In the last week of 2025, Switzerland and Liechtenstein recorded about 2,900 lab-confirmed cases, up roughly 22% week-on-week. The highest incidence was reported in Basel-Stadt, with notable regional variation.
Date: December 31, 2025. Source: swissinfo.ch