Multiple choice

Most commonly used selective medium for streptococcus mutans is __________.

  1. MacConkey’s medium

  2. Mitis-Salivarius-Bacitracin agar

  3. Nutrient agar

  4. Tellurite medium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mitis-Salivarius-Bacitracin agar (MSA) with 20% sucrose and 0.2 U bacitracin/ml is a selective medium for streptococcus mutans. Bacitracin present in the medium suppresses the growth of most non-S.mutans colonies.

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