Indeed, reports show that monocytes are recruited at the site of infections as innate effectors of the inflammatory response to microbes, killing pathogens via phagocytosis, production of reactive oxygen intermediate (ROIs)25, reactive nitrogen intermediate (RNIs)26,27, myeloperoxidase (MPO)28,29, and producing inflammatory cytokines30 that contribute to further amplifying the antimicrobial response31. Here, MPO is linked to infection.