Meningococcal infections are caused by the bacteria (germ), Neisseria meningitidis.
- The bacteria that cause meningococcal infections can be found in the nose and throat of 5 to 10 out of 100 people at any time.
- However, less than 1 out of 100 of these infected people will develop invasive meningococcal disease.
Meningococcal bacteria can cause life-threatening infections including meningitis (an infection of the lining of the brain), septicaemia (infection of the blood), and pneumonia (infection of the lungs).