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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.