**Question:** Measles elimination criteria

Core Concept: Measles elimination refers to the process of reducing the incidence of measles to a negligible level in a region or country, eventually leading to global eradication. The World Health Organization (WHO) and Centers for Disease Control and Prevention (CDC) have defined criteria to assess the progress towards measles elimination.

**Correct Answer:** D. Achieving at least 95% coverage with two doses of measles-containing vaccine in all age groups

**Why the Correct Answer is Right:**

The correct answer is D because achieving high vaccine coverage is essential for reducing the transmission of measles. The WHO and CDC recommend providing at least two doses of measles-containing vaccine (MCV) to the population. The first dose (MCV1) should be administered before the child reaches one year of age, and the second dose (MCV2) should be administered 28-364 days after MCV1. This strategy ensures that a sufficient number of children are vaccinated to interrupt the chain of transmission, ultimately leading to measles elimination.

**Why Each Wrong Option is Incorrect:**

A. 90% coverage with two doses of MCV is incorrect because a coverage of at least 95% is required to achieve measles elimination, as stated in the correct answer D. Lower coverage rates will not result in a significant reduction in measles cases.

B. Achieving 100% MCV coverage is not the sole criterion for measles elimination. While high coverage ensures that a large proportion of the population is immune, other factors like effective surveillance, laboratory confirmation, and good case management are also required to attain measles elimination.

C. "Measles-mumps-rubella (MMR) vaccine" is not the correct answer because the correct answer is "measles-containing vaccine" (MCV), which includes measles, mumps, and rubella vaccines combined or given separately. The focus here is on measles elimination, not MMR vaccination.

**Clinical Pearl:**

To achieve measles elimination, vaccination strategies should aim for at least 95% coverage with two doses of measles-containing vaccine (MCV) and ensure comprehensive surveillance, laboratory confirmation, and quality case management. This comprehensive approach will enable regions to progress towards eliminating measles and ultimately achieving global eradication.