I want to know the answer to the following question:
What did the first measles prevent in it's first 20 years?
All the background I'm provided with is that "The first 20 years of licensed measles vaccination in the U.S. prevented an estimated 52 million cases of the disease, 17,400 cases of mental retardation, and 5,200 deaths.". Is that enough to answer the question?
Answer: yes