Meningococcal disease is rare, but it is very serious. It can infect the lining around the brain and spinal cord or spread in the blood. It often comes on suddenly and can become life-threatening in hours. The MenACWY vaccine helps protect teenagers and young adults, who are at the highest risk, especially in places like schools, dorms, and camps where people live close together. Countries that give this vaccine in schools have seen cases drop sharply.

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