C5 and infection: Neutrophils play a major protective role against dissemination of C. neoformans (Lovchik and Lipscomb, 1993; Graybill et al., 1997), and C5aR signaling is required for infection-induced neutrophil recruitment to the brain as suggested by data obtained in a murine infection model using C5 deficiency and inhibitory anti-C5aR antibodies (Sun et al., 2016).