An antibiotic is a chemotherapeutic agent that inhibits or abolishes the growth of micro-organisms, such as bacteria, fungi, or protozoa. The first widely used antibiotic compounds used in modern medicine were produced and isolated from living organisms, such as the penicillin class produced by fungi in the genus Penicillium, or streptomycin from bacteria of the genus Streptomyces. more from Wikipedia

Fast Facts:

  • In 1926, Alexander Fleming discovered penicillin, a substance produced by fungi that appeared able to inhibit bacterial growth.
  • Antibiotics do not work against any viruses.
  • Frequent and inappropriate use of antibiotics selects for strains of bacteria that can resist treatment. This is called bacterial resistance.