” …..Presumably this is not such an issue in a Yeshiva Dorm…”
Hopefully you are correct but as a purely public health matter, the CDC strongly encourages the vaccination as do most state heath departments. There also are studies indicating transmission vectors via non-sexual but still “close” physical contacts which may very well be a concern in a yeshiva dorm where the bochurim “horse around” and engage in the same types of physical interactions as in any dorm. Also, there are very few side effects from meningococcal conjugate vaccine used to protect against bacterial meningitis. To my knowledge, there is no vaccine against the viral form of the disease.