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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Approximately 25% of all reported medication errors result from some kind of name confusion.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.