ANTIBIOTICS
Antibiotics are compounds produced by various species of microorganisms and have the capability to kill or inhibit the growth of other microorganisms. This definition makes a distinction between antimicrobial produced by microorganisms and those, which are totally synthetic.
This definition is rather academic and a word antibiotic now a day is often used to include all the three groups i.e. synthetic, semi synthetic and obtained from microorganisms. An ideal anti microbial agent exhibits selective toxicity meaning by that the drug is harmful to a parasite with out causing any harmful effects to the host.
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