LOTS of children get the Meningococcal vaccine, though.
All 11 to 12 year olds should get a meningococcal conjugate vaccine, with a booster dose at 16 years old. Teens and young adults (16 through 23 year olds) also may get a serogroup B meningococcal vaccine. CDC also recommends meningococcal vaccination for other children and adults who are at increased risk for meningococcal disease.
You HAVE to have it to enroll in most schools and colleges.
https://www.cdc.gov/vaccines/vpd/mening/index.html