The line graphs illustrate changes in the number of British children with whooping cough over 70 years from 1940 to 2010, after the introduction of a vaccine for this disease in 1955.
The line graphs illustrate changes in the number of British children with whooping cough over 70 years from 1940 to 2010, after the introduction of a vaccine for this disease in 1955. BJaBa
The line graphs illustrate changes in the number of British children with whooping cough over 70 years from 1940 to 2010, after the introduction of a vaccine for this disease in 1955.
Overall, the number of infected children was highest at the beginning of the period shown, but then fell sharply with the application of the vaccination, reaching a negligible figure in the last decade of the period given. Additionally, there were significant fluctuations throughout the period shown, except for the last decade.
In 1940, there were over 50, 000 cases, which then rose dramatically to a high of 170, 000 children two years later. However, the figure declined to a low of 60, 000 cases in 1947, before rising again to nearly 160, 000 in 1950.
1955 saw a fall in cough cases to approximately 90, 000 due to the use of the vaccine on over four-fifths of children. Following this, by 1975, a mere 30% of children had been vaccinated, leading to a growth in the cough cases to 60, 000 in 1980 and 1985. From that point, despite a slight rise in 1987, the number of infected children fell to a negligible figure (Almost 1, 000) due to the vaccination of the vast majority of British children (94%).
The line graphs illustrate
changes
in the number of British
children
with whooping cough over 70 years from 1940 to 2010, after the introduction of a vaccine for this disease in 1955.
Overall
, the number of infected
children
was highest at the beginning of the period shown,
but
then fell
sharply
with the application of the vaccination, reaching a negligible figure in the last decade of the period
given
.
Additionally
, there were significant fluctuations throughout the period shown,
except for
the last decade.
In 1940, there were over 50, 000 cases, which then rose
dramatically
to a high of 170, 000
children
two years later.
However
, the figure declined to a low of 60, 000 cases in 1947,
before
rising again to
nearly
160, 000 in 1950.
1955
saw
a fall in cough cases to approximately 90, 000 due to the
use
of the vaccine on over four-fifths of
children
. Following this, by 1975, a mere 30% of
children
had
been vaccinated
, leading to a growth in the cough cases to 60, 000 in 1980 and 1985. From that point, despite a slight rise in 1987, the number of infected
children
fell to a negligible figure (Almost 1, 000) due to the vaccination of the vast majority of British
children
(94%).