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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

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Cyanide works by making the human body unable to use oxygen.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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Medication errors are more common among seriously ill patients than with those with minor conditions.

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