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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.