title: Non-toxigenic Corynebacterium diphtheriae var gravis.
mesh_terms: D002648:Child; D003354:Corynebacterium Infections / Q000382:microbiology; D003353:Corynebacterium diphtheriae / Q000145:classification*; D004165:Diphtheria / Q000382:microbiology*; D006801:Humans; D008297:Male; D010612:Pharyngitis / Q000382:microbiology