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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.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.