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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.
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.