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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
By definition, when a medication is administered intravenously, its bioavailability is 100%.
On average, the stomach produces 2 L of hydrochloric acid per day.
The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
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.