The graph shows the impact of vaccinations on the incidence of whooping cough, a childhood illness, between 1940 and 1990 in Britain . Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

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 […]