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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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.