The graph below shows how many cases of measles were reported in the United States from 1921 to 2015....

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18. The graph below shows how many cases of measles were reported in the United States from 1921 to 2015. Measles is an infectious disease caused by a virus.
Figure 3. The number of reported cases of measles in the United States from 1921 to 2015.
The measles vaccine has been available in the United States since 1963. What happened to the number of reported measles cases at that time?

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18. The graph shows a significant decline in the number of reported measles cases after the introduction of the measles vaccine in 1963. Prior to the vaccine, the number of cases was high, but after the vaccine became available, the cases dropped dramatically, indicating the effectiveness of the vaccination program in controlling the spread of measles.

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The graph below shows how many cases of measles were reported in the United States from 1921 to 2015....

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