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Penicillin is the most widely used antibiotic in the world because it is effective against a variety of harmful microorganisms. It is used to treat scarlet fever, syphilis, diphtheria, bronchitis, meningitis, blood poisoning, pneumonia, and many other ailments. Some people are allergic to penicillin, however, it has a wide margin of safety. Injections of up to 100 million units have been given without any ill effects. Much of the penicillin manufactured is semisynthetic, but all originate from the mold penicillium notatum. In 1944, Fleming was knighted for his contribution to the field of medicine. He was thereafter known as Sir Alexander Fleming. In 1945, Fleming, along with Florey and Chain, was awarded a Nobel Prize for his discovery of penicillin. Alexander Fleming died in 1955.

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16y ago

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