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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
Blood is approximately twice as thick as water because of the cells and other components found in it.
In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).