Causes Of Bacteria In The 1920's

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In the 1920s, Griffith began an experiment that consisted of using two types of pneumonia causing bacteria, smooth and rough. The smooth bacteria that the experiment used had a capsule, while the rough lacked one. Griffith injected the types bacteria into the mice to determine the impact they had. When the mice were injected with live rough bacteria, they lived, and when the mice were injected with live smooth bacteria, they died. Griffith at this point had concluded that the capsule was the cause of death of these mice and he decided to conduct two more experiments. The first consisted of mice that were injected with heat-killed smooth bacteria, which resulted in the mice living. During the last test, Griffith injected live rough bacteria

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