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

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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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Medication errors are three times higher among children and infants than with adults.

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

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