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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.