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(antimicrobials include anti-viral, anti-fungal, and anti-parasitic drugs as well.) antibiotics are relatively harmless to the host, and therefore can be used to treat infections. the term "antibiotic," coined by selman waksman, originally described only those antibiotics derived from living organisms
, in contrast to "chemotherapeutic agents," which are purely synthetic. for example, there are antibiotics that are derived from mold , such as the penicillin class . currently, the term "antibiotic" is also applied to synthetic antimicrobials, such as the sulfa drugs (drugs containing sulfur ). human...
https://www.newworldencyclopedia.org/entry/Antibiotic