The line chart below shows the effect of vaccination on the number of reported cases of whooping cough, a childhood disease, in Britain.

The line chart below shows the effect of vaccination on the number of reported

cases

of whooping cough, a childhood disease, in Britain. The data was collected between the years 1940 and 1990.

Overall

, vaccination resulted in a great reduction in the spread of

this

illness. In 1940, there were already over 40 thousand

cases

reported.

This

number quickly tripled to just under 180,000 infected followed by the drop to its previous level. After that,

this

quantity fluctuated between 60,000 and 100,000 for the next 48 months. The second highest peak (above 160,000 affected) occurred in the early 1950s. In 1957, the vaccination began.

This

had resulted in a massive decrease in

cases

of cough by 1963, reaching

the

Correct article usage

a

show examples

minimum of under 20 thousand.

This

figure had fluctuated from about 0

cases

to 40,000 until 1978, which is when the vaccine uptake plummeted from 81 per cent down to 30. The result of that was the new peak achieved by the illness in just 24 months. Fortunately, people began to uptake the vaccine again at even higher rates, than before, which caused the cough to gradually become less spread until it was almost eliminated in the 1990's by keeping the number of affected slightly above 0.