Reverted edits by Ank (Talk); changed back to last version by Aschlafly
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]].