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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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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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Vaccines prevent between 2.5 and 4 million deaths every year.