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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Thyroid conditions may make getting pregnant impossible.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.