What is tkt agar

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Please call Customer Service at for substitute products. Specifications SKU:. Bring to the boil to dissolve completely. Description A selective medium for the rapid isolation of Streptococcus agalactiae and other streptococci involved in bovine mastitis.

Crystal violet or gentian violet and thallium salts have long been used in selective media for streptococci. Haxthausen 1 employed a selective crystal violet medium for the isolation of skin streptococci. Bryan 2 using gentian violet blood agar, found that the growth of saprophytic milk bacteria was prevented whilst that of streptococci was unaffected.

Edwards 3 employed a crystal violet aesculin blood agar for the cultural diagnosis of bovine mastitis, whilst McKenzie 4 used a medium containing thallium acetate for the same purpose. Hauge et al. Aesculin differentiates the negative Streptococcus agalactiae blue colonies from aesculin-positive Group D streptococci black colonies.

Look for pale blue colonies which should then be subcultured for further identification tests. Appearance Dehydrated medium: Straw coloured, free-flowing powder Prepared medium: Straw coloured gel with blue hue.