There is also mounting evidence of a spectrum of pulmonary vasculitis in COVID-19: neutrophilic capillaritis [3, 4], lymphocytic endotheliitis [5], lymphocyte-plasma cellular arterial vasculitis [6], obliterating endarteritis involving C5aR1+ macrophages [7 and MRP8+ mononuclear cell vasculitis [2]. This evidence concerns the gene C5AR1 and COVID-19.