%0 Case Reports %T Recurrent pyogenic infections caused by a novel Gln1420* mutation in the C3 gene. %A Coelho PS %A Gouveia C %A Pinto MV %A Neves C %A Cordeiro AI %A Neves JF %A Coelho PS %A Gouveia C %A Pinto MV %A Neves C %A Cordeiro AI %A Neves JF %J Front Pediatr %V 10 %N 0 %D 2022 %M 36299691 %F 3.569 %R 10.3389/fped.2022.1017195 %X C3 is a crucial protein of the complement system. Congenital C3 deficiency is extremely rare and manifests through recurrent, severe infections and should always be considered as a differential diagnosis of recurrent pyogenic infections. We report a case of a patient with a novel C3 gene mutation, responsible for complete C3 deficiency with impaired complement system activation and recurrent infections.