At what ages should the MMR vaccine be administered in a 2 dose series?

The MMR vaccine, which protects against measles, mumps, and rubella, is recommended to be given in a two-dose series at specified ages to ensure optimal immunity. The first dose is generally administered between 12 and 15 months of age. This timing is critical because infants are at a higher risk for these diseases, and the vaccine helps to stimulate an immune response when the child's immune system is ready to effectively respond to the vaccine components.

The second dose is typically given between 4 and 6 years of age, often coinciding with the child's pre-school immunizations. This booster dose is essential for reinforcing the immune response and ensuring long-lasting protection, particularly as children begin interacting more with others in school and community settings.

By adhering to this schedule, healthcare providers can help achieve high vaccination coverage, which is key to controlling outbreaks of these highly contagious diseases. Following this age schedule is in accordance with CDC recommendations, indicating that option B reflects the correct standard for MMR vaccination timing.