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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

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The human body produces and destroys 15 million blood cells every second.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

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