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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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.
Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.