TLR3 and COVID-19: According to this, Gebremeskel et al. [14] have evaluated the serum of 19 SARS-CoV-2 patients and 20 uninfected controls, showing that mast cells-derived proteases and eosinophil-associated mediators are increased in COVID-19 lungs and/or serum; they also observed that mast cells activation is induced through TLR3/7/8 stimulation.