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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.