Bài mẫu IELTS Writing Task 1: The graph shows the impact of vaccinations on the incidence of whooping cough, a childhood illness, between 1940 and 1990 in Britain.

The graph shows the number of reported cases of whooping cough in Britain from 1940, and the percentage of children who received the vaccine after vaccination began in the 1950s.

Overall, the number of whooping cough cases fell sharply after vaccination started. When the vaccine uptake dropped in the 1970s, the number of cases increased again, but it almost disappeared when the uptake became high.

Before vaccination, the number of cases was very high and it changed a lot. It reached a peak of about 173,000 in 1941 and was also around 170,000 in 1951. After vaccination began in about 1956, the number of cases dropped quickly to below 40,000 in 1960 and continued to be quite low.

The vaccine uptake was about 81% in the late 1960s, but then it fell to only 30% in the mid-1970s. At the same time, the cases increased again to about 65,000 in 1978 and 1982. After that, the uptake rose to over 90% and the number of cases fell to almost zero after 1990.