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An antibiotic is a substance derived from a microorganism which, in a dilute solution, is able to kill a bacterial infection. An antibiotic is useless against a [[virus]], however.
Antibiotics became widely used only after [[World War II]]. The history of antibiotics began, however, with the discovery in 1928 of [[Penicillin]] by [[Alexander Fleming]].
Antibiotics became widely used only after [[World War II]]. The history of antibiotics began, however, with the discovery in 1928 of [[Penicillin]] by [[Alexander Fleming]].