Bacteremia Caused by Neisseria elongata in an Infective Endocarditis Patient: Case Report and Review of Literature

Clin Lab. 2020 Jan 1;66(1). doi: 10.7754/Clin.Lab.2019.190333.


Background: Neisseria elongata (N. elongate) is a strictly aerobic and gram-negative rod bacterium which is a constituent of the commensal bacterial flora in the pharynx. Infection caused by Neisseria elongata is rarely reported. Here we describe a case of endocarditis in a patient after aortic mechanical valve replacement caused by N. elon-gate in China.

Method: A 30-year-old man suffered infective endocarditis after aortic mechanical valve replacement. Blood cultures were positive and the organism was identified as Neisseria elongata by MALDI-TOF MS as well as the 16S rRNA sequencing.

Result: The patient was treated with ofloxacin and meropenem. He was successfully treated with the 6-week course of antibiotic therapy.

Conclusions: N. elongate endocarditis is rarely reported. Our report expands the range of infection caused by N. elongate.

Publication types

  • Case Reports
  • Review

MeSH terms

  • Adult
  • Aged
  • Anti-Bacterial Agents / therapeutic use
  • Aortic Valve / microbiology
  • Bacteremia*
  • Child
  • Endocarditis, Bacterial*
  • Female
  • Humans
  • Male
  • Middle Aged
  • Neisseria elongata*
  • Neisseriaceae Infections*


  • Anti-Bacterial Agents