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| The way the chart is made, it is misleading as far as making any conclusions just looking at the lines as you suggest. If it was drawn to scale, one would see a different picture.
Whatever factors changed in the late 1930's -early 40's appear to have change the dynamics of how many people were terminally affected by contracting measles. Death rates went from (lots of incomplete data) 1-2% up to 7% at the beginning of the time frame, to hovering around .1% for a decade or 2 before the introduction of the vaccine, and stayed in that range through the 90's. Since then, infections have been very low, but if there is 1 death, on a percentage basis, is back up to about the same as 100 years ago.
The vaccine has greatly reduced infection rate, but other factors seem to have influenced death rate. At any rate, what is somewhat alarming, is that there seems to be an increase in vulnerable people the last 10 years.
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