Persistence of antibodies for 42 months following vaccination of adolescents with a meningococcal serogroups A, C, W-135, and Y tetanus toxoid conjugate vaccine (MenACWY-TT)

These results indicate that seroprotection following primary vaccination with MenACWY-TT extends more than 3 years. Ongoing persistence data are required to understand the duration of protection following vaccination and to guide decisions on the need for future booster doses.