I notice you’re asking about — likely referring to the clinical decision support resource UpToDate (from Wolters Kluwer), version 21.6.
If you need to cite version 21.6 in a formal document (e.g., retrospective study): uptodate 21.6
UpToDate is often described as the "gold standard" for clinical practice I notice you’re asking about — likely referring
Note for historians: While some COVID-19 guidance in 21.6 is now obsolete (due to Omicron variants and newer antivirals like Paxlovid), the framework for rapid pandemic response remains a model for future infectious disease outbreaks. uptodate 21.6
Key identifiers of version 21.6 include: