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How Did Alexander Fleming Use Antibiotics?

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An antibiotic is a type of medicine that completely destroys microorganisms (microscopic, single celled life forms) and stops them from growing. An antibiotic named penicillin is one of the most used antibiotics.
In 1928, Scottish scientist Alexander Fleming discovered penicillin for the first time. His discovery was an accident: he was in his laboratory and noticed that a window had been left open overnight. A Petri dish containing Staphylococcus bacteria was now growing blue-green mould.
Surrounding the mould, there was little bacterial growth, and Fleming concluded that there must be some sort of substance that the mould was producing that was breaking down and stopping the growth of bacteria. He discovered that it was Penicillium mould,
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