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College students have a greater risk of infection than the general population because of activities that are often part of college life, such as smoking, going out to bars, drinking alcohol, and living in a dormitory. The vaccine is a single shot, which provides protection starting in about 10 to 14 days and lasting about 3 to 5 years. Adverse reactions are mild and infrequent, consisting primarily of redness and pain at the site of injection lasting up to 2 days. Due to the cost and/or storage requirements the meningitis vaccine is ordered on an individual basis.