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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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.