Selective Agents

Several different types of antibiotics serve as selective agents in selective culture media to effectively isolate, or select for, a pathogenic microogranism from food, clinical, and environmental samples. Many times, these samples may contain a pathogenic microorganism among numerous types of relatively harmless bacteria and fungi. In order to effectively isolate the pathogenic organism, antibiotic selective agents are added to culture media to hinder growth of the harmless bacteria and fungi to ensure a non-competitive environment for the pathogenic organism.

An effective selective agent should not kill, or hinder the growth of the isolated pathogen. Theoretically, any antibiotic that doesn't target the selected pathogen but kills "background" growth of harmless microorganisms would be an ideal choice for use as a selective agent. The antimicrobials listed below are the most commonly used selective agents in established selective media formulations.

Click here for a list of the most commonly screened pathogens and selective agents.
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Teicoplanin packaged and labeled.
Teicoplanin is a glycopeptide antibiotic composed of a mixture of related compounds used to treat infections caused by methicillin...
Ceftazidime solubilized
Ceftazidime solubilized is a third generation cephalosporin antibiotic and is sparingly soluble in aqueous solution...
Ceftazidime hydrochloride
Ceftazidime pentahydrate is a third generation cephalosporin antibiotic.
Colistin sulfate, EP
Colistin is a unique sparingly soluble cyclic polypeptide antibiotic known as a polymyxin...
Rifampicin sodium
Rifampicin sodium is a bacterial protein synthesis inhibiting antibiotic...
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