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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").