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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.