Neisseria meningitidis

Neisseria meningitidis


See 'Additional Information'


General Information

Encapsulated Gram negative diplococci.

Normal flora. Humans are the reservoir.

Quadrivalent vaccine prevents disease by serogroups A/C/W-135/Y.

Occurs in outbreaks particularly in crowded settings.

Colonizer and cause of invasive disease:

  • Meningitis
  • Meningococcemia


  • Pneumonia
  • Septic arthritis
  • Pericarditis
  • Conjunctivitis
  • Others

Generally of little significance when cultured from nonsterile sites e.g. genital, pharynx.

Consult Infectious Diseases for invasive disease.

Contact and droplet precautions until 24hrs of appropriate antimicrobial therapy.

Prophylaxis may be required for close contacts and healthcare workers.