Product: Select Strep. TSA + 5% Def. Sheep Blood + Aesculin

Highly selective due to the addition of special inhibitors making it highly selective for Streptococci, particularly when Gram negative bacilli (e.g. Proteus) are present and tend to overgrow on conventional plates. Group D Streptococci are capable of hydrolyzing Aesculin to glucose and aglycone 6-7 dihydroxycumarin: The aglycone reacts with the iron salts in the medium giving them a black coloring. Group B Streptococci can be identified by the “camp effect” by making a single streak of the unknown bacteria perpendicularly to a strain of Staphylococcus aureus that is known to be crystal violet resistant and produces βeta-Lysin.