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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The horizontal fraction bar was introduced by the Arabs.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.