Famous Biologist
...o study for seven months at Johns Hopkins Hospital. He and some other doctors studied typhoid fever and discovered that flies carried it. At this time in history, 90,000 people in the United States had died of the disease. Many American soldiers in Cuba had died also. Reed observed people who cared for the patients with yellow fever didn't get the disease unless they had been exposed to the disease on their own. He concluded that people didn't catch it from each other. He remembered the research they had done on typhoid fever. He wondered if maybe mosquitoes might be spreading it. Some of the doctors and soldiers volunteered to take part in the experiment. To conduct the experiment, they let the mosquitoes bite the arms of men who already were infected with yellow fever. Then th...