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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

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

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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

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

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