To test the validity of TSI media, quality control should be performed using which two organisms?
a. Gardnerella and Lactobacillus
b. Erysipelothrix and Gardnerella
c. Propionibacterium and Lactobacillus
d. Actinomyces and Arcanobacterium
B
Only Erysipelothrix produces H2S in TSI agar. All other organisms are negative; therefore, the only positive and negative organisms used for quality control purposes are Erysipelothrix and Gardnerella.
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