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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.
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People about to have surgery must tell their health care providers about all supplements they take.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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.