Subtle symptoms, rapid progression, potential for death within 24 hours, and the risk of multiple reinfections are critical facts parents must understand about hand-foot-and-mouth disease in children.

If I get vaccinated only after exposure to a meningococcal patient, will it be effective in preventing the disease? (Ut Oanh, 27, Ca Mau)

My three-year-old child has grade one hand, foot, and mouth disease and is being monitored at home. They are scheduled for a meningococcal vaccine; when can they receive it? (Hai Nam, 30, An Giang)

I have received flu vaccinations for two consecutive years and found them effective in preventing the flu. Next week, I have an appointment for a booster shot; will this overload my immune system? (Thien An, 30, Phu Tho)

Chickenpox season is here. How easily does it spread, and are vaccines available? (Thuy Ngan, 39, Ha Tinh)