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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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People about to have surgery must tell their health care providers about all supplements they take.
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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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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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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.