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Health A-Z

What is meningococcal disease?

Meningococcal disease is any type of infection that’s caused by the bacteria Neisseria meningitidis, which is also called meningococcus. The bacteria can infect the meninges and the blood. These infections can be serious, even fatal. They’re called meningococcal meningitis and meningococcal septicemia.

The word “meninges” means the three membranes that cover your central nervous system, which is made up of your spinal cord and brain. Membranes are thin layers of tissue that provide protection for the content of the tissues. (Think of how oranges and grapefruits are sectioned off.) Technically, the largest membrane is our skin.

The three meninges are pia mater, arachnoid and dura mater.