Salvia, a genus that includes various species such as Salvia officinalis (common sage) and Salvia miltiorrhiza (Danshen), has a long history of use in traditional medicine for a variety of ailments, including respiratory infections like influenza. In European herbal medicine, particularly with Salvia officinalis, sage tea has been used to relieve symptoms of sore throat, cough, and fevers, which are common in influenza. The reasoning behind its use is based on its aromatic, astringent, and purported antimicrobial properties, as well as its role in soothing mucous membranes.

However, while in vitro studies have shown that certain Salvia species possess antimicrobial and mild anti-inflammatory effects, there is little direct scientific evidence or clinical trials demonstrating efficacy specifically against influenza viruses in humans. Most modern pharmacological research on Salvia focuses on its antioxidant and general antimicrobial activities rather than direct antiviral effects against influenza. The use of Salvia for influenza remains primarily supported by traditional use and anecdotal reports rather than robust scientific validation.

In summary, Salvia is traditionally used to support symptoms associated with influenza, but this practice is not strongly supported by scientific studies or high-quality clinical evidence.