Which statement correctly describes Shigella dysenteriae?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the Clinical Laboratory Science Bacteriology Test. Engage with multiple choice questions and flashcards with helpful hints and explanations. Ace your exam confidently!

Multiple Choice

Which statement correctly describes Shigella dysenteriae?

Explanation:
Shigella dysenteriae is a non-lactose-fermenting, hydrogen sulfide–negative enteric bacterium. On common diagnostic media like MacConkey agar, it does not ferment lactose, so colonies appear colorless or pale. In H2S tests (such as TSI slants), it does not produce hydrogen sulfide, so there’s no blackening. It also does not typically utilize citrate. Therefore, the description that fits best is H2S negative and non-lactose-fermenting. The other options point to features seen in lactose-fermenting organisms or H2S producers, which Shigella dysenteriae does not have.

Shigella dysenteriae is a non-lactose-fermenting, hydrogen sulfide–negative enteric bacterium. On common diagnostic media like MacConkey agar, it does not ferment lactose, so colonies appear colorless or pale. In H2S tests (such as TSI slants), it does not produce hydrogen sulfide, so there’s no blackening. It also does not typically utilize citrate. Therefore, the description that fits best is H2S negative and non-lactose-fermenting. The other options point to features seen in lactose-fermenting organisms or H2S producers, which Shigella dysenteriae does not have.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy