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There are 20 feet of blood vessels in each square inch of human skin.
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.
By definition, when a medication is administered intravenously, its bioavailability is 100%.
Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.