POLIO BEFORE AND AFTER THE VACCINE
3. What trend does the graph show? What explains the trend?
between the year 1950 to 1963
Reported Number of Cases
Per 100,000 People
is from 0 to 40
the years is from 1950 to 1963
in the year 1950 it was 21
in the year 1951 it was 18
in the year 1952 it was 36
in the year 1953 it was 22
in the year 1954 it was 23
in the year 1955 it was 17
in the year 1956 it was 9
in the year 1957 it was 3
in the year 1958 it was 3
in the year 1959 it was 5
in the year 1960 it was 2
in the year 1961 it was 1
in the year 1962 it was 1
in the year 1963 it was 0