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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.