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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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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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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.