Septicaemia caused by Neisseria flavescens.

Septicaemia caused by N. flavescens is reported for the first time. The septicaemia developed following dental surgery, and the clinical picture was indistinguishable from that of chronic meningococcaemia. The skin lesions resembled the cutaneous manifestations of gonococcaemia. The patient responded to treatment with sulphonamides and penicillin with no relapse over 18 months of follow-up.