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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.