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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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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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Your heart beats over 36 million times a year.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.