The graph gives information about the effect of vaccinations on the number of cases of whooping cough, a childhood illness, in Britain from 1940 to 1990.
Overall, when the epidemic of whooping cough appeared in 1940, the incidence of whooping cough was an upward trend. After the government had vaccine, the proportion of whooping cough was a downward trend in the late 1950s.
The number of cases of whooping cough rocketed from 50,000 to a high of 170,000 in the 1940s. However, falling dramatically to 60,000 cases of whooping cough. Unfortunately, although the figures went down during the period of a few years, the percentage of that cases peaked again to 170,000. By the late 1950s, The vaccine of whooping cough appeared in Britain. Surprisingly, the number of cases of whooping cough dropped sharply to nearly 10,000 in the 1960s.
However, the percentage of vaccine’s consumption fell significantly from 81% to 30% in the mid-1970s. Consequently, this leads to a parallel increase in the number of the illness in Britain, increasing from 10,000 to nearly 60,000 cases of the illness. Later, the proportion of vaccine’s consumption rose dramatically from 30% to 94% from the late 1970s to the mid-1990s. The incidence of whooping cough decreased drastically from nearly 60,000 in late 1970s to 0 in the mid-1990s.