the present invention relates to a culture medium for bacteria to be usedin anaerobic conditions, comprising at least one metal complex, which isthe oxidative polymerization of an indoxyl derivative and a substrate containing aindoxyl derivative leads to a colored compound solution. the complexin particular, the metal, ferric ammonium citrate, concentrationbetween 0.3 and 0.9 mg / ml, preferably 0.6 mg / ml can,.culture medium according to the invention may include a substrate, such as x - galat a concentration of between 10 and 500 mg / l.
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