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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Nystatin packaged and labeled.
Nystatin is a sparingly soluble (0.360 mg/mL) fungicidal and fungistatic polyene antifungal.
Cefixime trihydrate packaged and labeled.
Cefixime trihydrate is a third generation cephalosporin antibiotic. Cefixime trihydrate is a broad spectrum...
Cefoperazone sodium packaged and labeled.
Cefoperazone sodium is a third generation cephalosporin antibiotic.
Sulfadiazine packaged and labeled.
Sulfadiazine is a bacteriostatic sulfonamide antibiotic. Sulfadiazine interferes with the folic acid metabolism in bacteria by...
Cefotetan packaged and labeled.
Cefotetan is a cephamycin antibiotic grouped with the second generation cephalosporins.  Cefotetan is sparingly soluble...
Cefotetan disodium packaged and labeled.
Cefotetan disodium is a cephamycin antibiotic grouped with the second generation cephalosporins. Cefotetan is sparingly soluble in...
Vancomycin packaged and labeled.
Vancomycin is a bactericidal glycopeptide antibiotic that inhibits gram-positive bacterial by interfering with cell wall synthesis.
Cefoxitin sodium, USP packaged and labeled.
Cefoxitin sodium is a cephamycin β-lactam antibiotic grouped with the second generation...
Cycloheximide Solution (10% in DMSO, Sterile)
Cycloheximide Solution (10% DMSO, Sterile) is a protein synthesis inhibitor in eukaryotic cells.
Vancomycin HCl, USP packaged and labeled.
Vancomycin HCl, USP is a bactericidal glycopeptide antibiotic that inhibits gram-positive bacterial by interfering with cell wall synthesis.
Cefoxitin packaged and labeled.
Cefoxitin is a cephamycin β-lactam antibiotic grouped with the second generation cephalosporins.  Like many cephamycins...
Cefsulodin sodium packaged and labeled.
Cefsulodin sodium is a third-generation cephalosporin antibiotic.Recently, TOKU-E has found that the main cause...
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