Definition of Meningococcal infection

Meningococcal infection: Infection with the bacterium Neisseria meningitidis. (Neisseria was formerly called Meningococcus and the term "meningococcal" is still entrenched.)

Persons with a meningococcal infection may have any of several acute illnesses, including:

• meningitis and sepsis (blood infection),
• meningitis in the absence of sepsis,
• sepsis in the absence of meningitis,
• a predominantly cutaneous (skin) condition called purpura fulminans, or
• some combination of these conditions.

Other illnesses that can occur from meningococcal infection in the absence of sepsis include pharyngitis (throat infection), conjunctivitis (eye infection), pneumonia, and arthritis.

See also: Meningococcal meningitis; Meningococcal vaccine; Meningococcemia; Meningococcus.