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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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There are approximately 3 million unintended pregnancies in the United States each year.