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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.
There are more bacteria in your mouth than there are people in the world.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
People about to have surgery must tell their health care providers about all supplements they take.
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.