My child received the meningococcal group B vaccine at 2 months old. Recently, when I took them for a chickenpox vaccine, the doctor checked the vaccination history and advised an additional ACYW meningococcal vaccine. Is it necessary? (Vu Quynh, 30 years old, TP HCM)

Concerned by a meningococcal case in Phu Quoc, I vaccinated my child against group B, but was advised to also vaccinate against groups A, C, Y, W. Is this additional vaccination necessary? (Thuy Van, 43, An Giang)