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This is Science in the News. Im Shirley Griffith. And Im Christopher Cruise. Today, we tell the stories of some medical heroes.At the start of the 20th century, the United States Army had a Yellow Fever Commission.The Army wanted medical experts to study yellow fever and find a way to stop the disease.One team went to Cuba to test the idea that mosquitoes spread yellow fever.The team was led by Walter Reed, the Army doctor and scientist noted for his work on infectious diseases.In August of 1900, the researchers began to raise mosquitoes and infect them with the virus. Nine of the Americans let the infected insects bite them. Nothing happened.Then, two more let the mosquitoes bite them. Both men developed yellow fever.A doctor named Jesse William Lazear recognized that the mosquitoes that bit the last two men had been older than the others.
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