Which of the following is TRUE regarding Neisseria meningitidis infection?

For children >3 months old, the most common organisms are S. pneumoniae, Neisseria meningitidis, and Staphylococcus aureus, with a lower incidence of S. pneumoniae meningitis since routine vaccinations with the conjugate vaccine. Penicillin has long been the treatment of choice for meningococcal infections and sulfonamides are used only for chemoprophylaxis because of resistance. Serogroup A epidemics have been largely confined to tropical countries. Both MCV4 and MPSV4 can be given to individuals who are immunosuppressed. Ref: Ray C.G., Ryan K.J. (2010). Chapter 30. Neisseria. In C.G. Ray, K.J. Ryan (Eds), Sherris Medical Microbiology, 5e.