In an anti malarial campaign in a certain area, quinine was administered to 1,624 persons out of a total population of 6,496. The number of fever cases is shown below : Treatment Fever No Fever Total Quinine 40 1.584 1,624 No quinine 440 4,432 4,872 Total 480 6,016 6,496 Discuss the usefulness of quinine in checking malaria.
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