Infective Endocarditis Due to Neisseria elongataNoheria, Amit MBBS, SM; Anderson, Peter W. MD; Tapia-Zegarra, Gino G. MD; Baddour, Larry M. MD; Wilson, Walter R. MDInfectious Diseases in Clinical Practice: November 2010 - Volume 18 - Issue 6 - pp 355-358 doi: 10.1097/IPC.0b013e3181e536de Review Articles Abstract Author Information We present 2 cases of prosthetic valve endocarditis due to Neisseria elongata subspecies nitroreducens and elongata. Neisseria elongata is a fastidious, immotile, oxidase-positive, gram-negative bacillus found in the human oropharyngeal flora that is a rare cause of infective endocarditis. It is distinguished from Kingella kingae, Eikenella corrodens, and other organisms based on extended biochemical testing and 16S recombinant DNA sequencing. We review the literature on N. elongata endocarditis and highlight the similarities between N. elongata and HACEK organisms regarding their biochemical profiles and clinical features of infective endocarditis. From the Division of Infectious Diseases, Department of Medicine, Mayo Clinic College of Medicine, Rochester, MN. Correspondence to: Dr. Walter R. Wilson, MD, Division of Infectious Diseases, Mayo Clinic, 200 First St. SW, Rochester, MN 55905. E-mail: firstname.lastname@example.org. The authors have no funding or conflicts of interest to disclose. Ethics review/informed consent is not applicable. © 2010 Lippincott Williams & Wilkins, Inc.