The word ''antibiotic,'' though meaning antilife, has been commonly accepted as a term for antibacterial or antimicrobial agents, particularly those synthesized by bacteria or other microorganisms. Those antibacterial agents produced by chemical synthesis are often referred to as chemotherapeutics. Certain compounds containing arsenic, sulfur, and copper are members of this grouping and may be included in discussions of antibiotic usages. Subtherapeutic use has been accepted as a term for using these substances at relatively low levels in situations in which there is no apparent or detectable disease involved.

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