Evaluation of Thallium Acetate-Citrate Medium for Isolation of Enterococci1

Abstract

Thallous acetate-citrate (TAG) agar, a selective medium for isolating enterococci from frozen foods, was evaluated. Two types of bacteria, micrococci and group N streptococci, were responsible for erroneously high enterococcus counts on TAC agar. Selectivity of the medium was improved by the addition of 0.01% sodium azide.