Exploring viral aetiology in upper respiratory tract infections: insights from metagenomic next-generation sequencing in Swiss outpatients before and during the SARS-CoV-2 pandemic. Swiss Med Wkly [Internet]. 2024 Apr. 5 [cited 2025 Oct. 14];154(4):3797. Available from: https://smw.ch/index.php/smw/article/view/3797