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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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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.