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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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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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Excessive alcohol use costs the country approximately $235 billion every year.