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

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

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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

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