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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.