Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Models for the electron orbitals and energy shells of carbon