Meningococcal vaccines are used all over the world, especially in regions such as the United States. Meningococcal vaccines protect against Neisseria meningitis. This disease affects the lining of the head and neck in men and is caused by a bacteria called Neisseria meningitis. Men who have never had meningitis before are more at risk. Meningococcal vaccination refers to any of the basic vaccines used to prevent illness by Neisseria meningitides. The various models are effective against some or all of these groups of meningococci: A, B, C, W-series, Y, and Z. The meningococcal vaccines are usually between 85% and 100% efficient for at least three years. However, if the meningococcal infection has reoccurred or become recurrent, the vaccination may need to be repeated for some time. If there is a successful infection after the third anniversary, the interval can be lengthened.
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