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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.

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Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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