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Each year, between 1,400 and 2,800 people in the United States get meningococcal disease. ¹

Babies under 12 months are most likely to get the disease, followed by teenagers.¹

Between 1 in 10 and 1 in 4 people are carriers of meningococcal bacteria.² This means they have the bacteria in their bodies without being ill. They have the bacteria in their throats, but don't usually have any symptoms.

The bacteria can spread through fluid from people's mouths. The bacteria could be spread by kissing or by coughs and sneezes. Most people who carry the bacteria or who are exposed to carriers don't get sick. But a few people do. We're not sure why.²

This information is for educational use only, and is not a substitute for prompt professional medical advice. Readers should always consult a physician or other professional for advice and treatment. ©BMJ Publishing Group Limited 2008. All rights reserved.