The first quote is about Americans of all ages, second quote concerns children specifically. Edit- Missed your last line. "Children" is also a fairly broad cat

The first quote is about Americans of all ages, second quote concerns children specifically. Edit- Missed your last line. "Children" is also a fairly broad categorization that may include infants. I would expect measles to be at least 10 times more deadly on younger children than healthy adults. So those numbers kind of add up to me.