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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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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.