Acute contagious illness, characterised by fever, petechial or purpuric rash, and signs of sepsis and/or meningitis.
May progress rapidly to septic shock, with hypotension, acidosis, and disseminated intravascular coagulation.
Highest rates of invasive infection are in children under 5 years of age, especially under 1 year of age, with a second peak occurring in 11- to 22-year-olds and third peak in people >65 years of age.
Diagnosis confirmed by isolation of Neisseria meningitidis from a normally sterile body site.
Confirmed meningococcal infection is treated with a third-generation cephalosporin. Where a cephalosporin is not appropriate, the choice of agent is based on the individual patient circumstances, antibiotic susceptibilities, and local availability.
Case fatality rate is 10% to 15%. Between 10% and 20% of survivors have moderate to severe sequelae, including hearing loss, motor and cognitive disabilities, blindness, or ischaemic injuries of the skin or extremities.
Meningococcal infections are caused by Neisseria meningitidis , a gram-negative diplococcus that colonises the nasopharynx. Bacteria invade the bloodstream or spread within the respiratory tract. A case is confirmed by detection of N meningitidis -specific nucleic acid (using a validated polymerase chain reaction assay) in a specimen obtained from a normally sterile site (e.g., blood or cerebrospinal fluid), or by isolation of N meningitidis from a normally sterile site or from purpuric lesions.  Probable cases include those where N meningitidis antigen is detected by immunohistochemical staining on formalin-fixed tissue, or in cerebrospinal fluid by latex agglutination.
St. Jude Children's Research Hospital
Associate Professor of Pediatrics
University of Tennessee Health Sciences Center
EA declares that she has no competing interests.
Meningitis and Vaccine Preventable Disease Branch
NM declares that she has no competing interests.
Professor of Pediatrics
VD declares that she has no competing interests.
Clinical Epidemiology Unit
Marilia Medical School
LOC declares that she has no competing interests.
Consultant in Infectious Diseases and Tropical Medicine
Hospital for Tropical Diseases
KA declares that she has no competing interests.
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