Which statement about the MMR vaccination schedule is correct?

Which statement about the MMR vaccination schedule is correct?

• A. Two doses, first at 12-15 months and second at 4-6 years
• B. One dose at 6 months
• C. Delivered as a nasal spray
• D. Contraindicated in all children

Answer: (A)

The main idea tested is how the MMR vaccine is scheduled to maximize long-lasting immunity. Measles, mumps, and rubella immunity is best achieved with a two-dose plan given in childhood. The first dose is timed after maternal antibodies decline, typically around 12 to 15 months, to establish initial protection. A second dose is given around 4 to 6 years to catch anyone who didn’t respond to the first dose and to boost immunity so protection remains through the school years. This two-dose approach raises overall immunity in the population and supports protection during times of higher exposure. The vaccine is administered by subcutaneous injection, not as a nasal spray. It isn’t universally contraindicated in all children; only specific conditions—such as severe immunodeficiency or a severe allergy to a previous dose—would lead to avoiding it. A single dose at 6 months isn’t used in routine practice because immunity at that age is unreliable due to maternal antibodies and lower seroconversion rates.

The main idea tested is how the MMR vaccine is scheduled to maximize long-lasting immunity. Measles, mumps, and rubella immunity is best achieved with a two-dose plan given in childhood. The first dose is timed after maternal antibodies decline, typically around 12 to 15 months, to establish initial protection. A second dose is given around 4 to 6 years to catch anyone who didn’t respond to the first dose and to boost immunity so protection remains through the school years. This two-dose approach raises overall immunity in the population and supports protection during times of higher exposure. The vaccine is administered by subcutaneous injection, not as a nasal spray. It isn’t universally contraindicated in all children; only specific conditions—such as severe immunodeficiency or a severe allergy to a previous dose—would lead to avoiding it. A single dose at 6 months isn’t used in routine practice because immunity at that age is unreliable due to maternal antibodies and lower seroconversion rates.