Penicillin was discovered by chance by British scientist Alexander Fleming in 1929. Fleming was growing colonies of staphylococcus bacteria, the cause of a number of diseases from boils to pneumonia, in culture plates in his laboratory. One of the plates had not been covered and airborne spores settled in it and formed a mould. Fleming was about to throw away the contents when he noticed that the mould had destroyed the bacteria in the area around it.
He realised that the mould was producing a substance that was lethal to the bacteria. He also realised that the substance could be used to cure diseases caused by the bacteria. As the mould was called Penicillium notatum, he named the unknown substance ‘penicillin’. Ten years later in 1940, Howard Florey and E. B. Chaim managed to isolate penicillin in the laboratory and showed that it could be safely administered by mouth, by injection or applied directly to wounds.
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