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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Illicit drug use costs the United States approximately $181 billion every year.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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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.