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Figure 1 - Annual number of reported cases of diphtheria, Canada, 1924 – 2012

The image consists of two line graphs showing the reported number of cases of diphtheria in Canada over time in years. There is one main graph and a smaller graph embedded within the main graph at the top right corner.

In the main graph, the x axis represents time in years between 1924 and 2012 and the y axis represents the number of cases starting with 0 at the bottom to 10000 at the top. The year in which Canada introduced the diphtheria vaccine is depicted with an arrow as 1926. The line represents the number of cases, which start from 9057 cases in 1924. A sharp decline in cases occurs from 9010 cases in 1929 to 2031 cases in 1936. The number of cases increases to over 3000 in 1938 and fluctuates around the 3000 mark until it begins another steady decline in 1945 down to 38 cases by 1959.

The smaller graph inserted within the main graph shows the number of diphtheria cases reported between the years 1955 and 2012. The x axis depicts the time in years, and the y axis the number of reported cases starting from 0 at the bottom to 200 at the top. A steady increase in cases in observed from 23 cases in 1964 to 173 cases in 1974 followed by another sharp decline in cases to less than 10 cases reported each year from 1984 onward. Between 0 and 4 cases were reported each year from 1992 to 2012.

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