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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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