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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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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.