I guess that is due to better care of those who get sick. And is probably the reason for a slow decline over the intervening 45 years, missing in your chart? Rather than a sudden decline just after vaccine came into use?
That was hand typed because the file is a image pdf, so no copy and paste. I included the link to the file so that you could look at it yourself. I do have a slightly different version, which I will include at the end of this message. Edit to add: It was
NOT a slow decline, it was a sudden one after 1963, and more decreases with vaccine programs (there is an issue getting everyone vaccinated).
ETA: So the "case fatality rate" went from 1:1,000 to 1:100? TEN TIMES WORSE?
Um, you need to look at the figures a bit more. In 1987 to 1991 most of the cases were in California, and were more often the poor,
Pediatric hospital admissions for measles. Lessons from the 1990 epidemic. It is one reason for a push by county public health departments to buy and distribute vaccines to all, especially low income. I know that my state started a program of mailing reminders to anyone with a child born after 1992 (like my now 15 year old daughter).
Anyway, here is my other chart, and yes, it still is missing some years --- but you are welcome to go and read
http://www.cdc.gov/vaccines/pubs/pinkbook/downloads/appendices/appdx-full-g.pdf yourself:
Disease: Measles in the USA
Year__Cases___Deaths
1961__423,919_434
1962__481,530_408
1963__385,156_364
(^^ first vaccine licensed)
1964__458,083_421
1965__261,905_276
1966__204,136_261
1967___62,705__81
1968___22,231__24
1969___25,826__41
1970___47,351__89
1971___75,290__90
(^^^ MMR licensed)
1972___32,275__24
1973___26,690__23
1974___22,690__20
1975___24,374__20
1976___41,126__12
1977___57,245__15
1978___26,871__11
(^^^ Measles Elimination Program started)
1979___13,597___6
1980___13,506__11
1981____2,124___2