Is the meningitis booster really necessary?

[i_wanna_be_Brown]

[OP is] asking if there’s scientific evidence for the booster.

Of course there is evidence for adding the booster. You can’t just add doses to a vaccine for no reason:

After licensure, additional data on bactericidal antibody persistence, trends in meningococcal disease epidemiology in the United States, and VE have indicated many adolescents might not be protected for more than 5 years. Therefore, persons immunized at age 11 or 12 years might have decreased protective immunity by ages 16 through 21 years, when their risk for disease is greatest.

http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6003a3.htm