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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.
People about to have surgery must tell their health care providers about all supplements they take.
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
On average, the stomach produces 2 L of hydrochloric acid per day.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

