make the research question better What are the direct implications of MMR vaccination coverage with vaccination program on the incidence rate of measles infections?

How does the level of MMR vaccination coverage within a vaccination program directly impact the rate of measles infections?

To improve the research question, you can consider the following revision:

"What is the relationship between MMR vaccination coverage and the incidence rate of measles infections, and what are the direct implications of the vaccination program in reducing measles cases?"