KDR and COVID-19: Ficolin-1 is a known activator of the complement system and innate immunity through recognition of pathogen-associated molecular patterns (PAMPs) (Bidula et al., 2019; Polycarpou et al., 2020), while VEGFR2 has been related to COVID-19 progression (Kong et al., 2020; Birnhuber et al., 2021).