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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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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.