Question

multiple choice 2 points
the disease polio sickened thousands of children. the graph depicts the number of polio cases that occurred between 1952 and 1973, based on information from the us department of health, education, and welfare and the centers for disease control. based on the data shown, which of the following statements is true?
polio cases in the united states 1952 - 1973
introducing a vaccine for polio had no effect on the number of cases diagnosed each year.
the vaccine proved ineffective because cases of polio rose between 1957 and 1959.
the sources of the data are not reliable and therefore the data should be ignored.
the polio vaccine was effective in protecting thousands of people from the disease.

Explanation:

The graph shows a significant decline in the number of polio cases after the vaccine was introduced in 1955, indicating its effectiveness. Small fluctuations like the rise between 1957 - 1959 are likely due to other factors and do not invalidate the overall trend. The data sources are from official health - related organizations and are generally reliable.

Answer:

The polio vaccine was effective in protecting thousands of people from the disease.