While state laws vary, the evidence and recommendations are clear; keep your child in a booster seat until he or she reaches a height of at least 4 feet 9 inches to help prevent injuries in a car crash.
booster seat on the market.
Although evidence has not ruled out a booster shot later in life, all research addressing the vaccine's effectiveness throughout its six-year use indicates that chickenpox may be the first human herpes virus to be wiped out.
The U.S. Food and Drug Administration (FDA) required Merck to follow several thousand children for 15 years, to determine the long-term effects of the vaccine and whether additional booster shots of VZV would be necessary.
The standard course of immunization for healthy children is three doses of DPT (diphtheria-tetanus-pertussis) preparation given between two months and six months of age, with booster doses given at 18 months and at entry into school.