A man named Edward Albert Sharpey-Schafer studied the pancreas, which led to the discovery of insulin. But in 1921 Frederick Banting extracted insulin from a dog's pancreas. He then injected insulin into dogs who had had their pancreases removed and saw the animal's blood sugar level drop. The use of insulin is still used in people with type one and type two diabetes. The 19th century was a time of development for vaccines. A very common vaccine invented in 1926 was against whooping cough. Whooping cough is also a highly contagious disease that consists of a loud cough that makes a "whooping" sound upon inhalation. In the 1920s this disease killed at least six thousand children a year. This disease can last up to one hundred days and can be prevented or treated with a vaccine. A larger disease that claimed two million lives a year was tuberculosis. It was an airborne disease, very contagious, which was treated with a vaccine. Doctors have been able to cure patients suffering from this disease and reduce the number of lives affected by this disease. The Roaring Twenties were a time of discoveries in the treatment of various diseases and