Selective culture media are used to recover pathogens from samples containing mixture of microorganisms such as feces. For example, Salmonella-Shigella (SS) agar contains about five times the concentration of bile salts compared with MacConkey agar and is more inhibitory to E.coli and more selective for the recovery of Salmonella species from stool cultures.
Various compounds may serve to inhibit the growth of certain undesired microorganisms, thus making the medium selective. Relative concentrations of these substances are important in determining the selectivity of the medium.
Phenylethyl alcohol agar (PEA) is a selective medium used to cultivate Gram-positive cocci, from a sample containing a mixed flora.
Tinsdale Agar is used for the selective isolation and differentiation of C. diphtheriae from diphtheroids.
Deoxycholate citrate agar is used for the selective isolation and differentiation of Salmonella and Shigella species.
Bismuth sulfite agar is a modification of original Wilson and Blair medium used for the isolation of Salmonella typhi and other salmonellae.
Salmonella-shigella (SS) agar is commonly used for the selective isolation and differentiation of Salmonella and Shigella.
Thayer-Martin agar is a selective medium used for the isolation of Neisseria gonorrheae from specimens containing a mixed flora of bacteria.
Originally formulated for dermatophyte growth and pigment production, SDA is used for growth and maintenance of fungi.
First reported by Baird–Parker, it is a selective medium for the enumeration of Staphylococcus aureus in foods.
Cetrimide agar test the ability of an organism to grow in the presence of cetrimide.
XLD Agar is a selective and differential medium for the isolation, cultivation, and differentiation of gram-negative enteric microorganisms.
Hektoen Enteric Agar (HE) is a selective and differential medium to isolate and differentiate Salmonella and Shigella from other Enterobacteriaceae.
New York City medium is primarily designed for the isolation of pathogenic Neisseria. It also supports the growth of genital mycoplasmas.
TCBS agar is a selective as well as differential culture medium used for selective isolation and differentiation of Vibrio species.
Eosin methylene blue (EMB) agar is a selective and differential medium used to isolate fecal coliforms.
Selective (against gram-positive bacteria) and differential culture medium (LF and NLF), commonly used for the isolation of enterics.