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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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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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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.