IL6 and Recurrent upper respiratory tract infections: More recently, a herbal drug containing—among its several components—polydatin and quercetin, is already used in the Traditional Chinese Medicine for the treatment of the upper respiratory tract infections; it has been shown to have antiviral and broad anti-inflammatory effects, with a reduction of IL-6, IL-10, TNF-α, IFN-γ in coronavirus-infected mice [37].