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Vaccines prevent between 2.5 and 4 million deaths every year.
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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.