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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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People about to have surgery must tell their health care providers about all supplements they take.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.