Podcast
Questions and Answers
Which of the following statements is true about Klebsiella?
Which of the following statements is true about Klebsiella?
- Klebsiella is a motile bacterium with peritrichous flagella.
- Klebsiella is a facultative anaerobe that is oxidase-positive.
- Klebsiella forms mucoid colonies due to being capsulated. (correct)
- Klebsiella reduces nitrate and ferments glucose.
What distinguishes Shigella and Klebsiella from other members of Enterobacteriaceae?
What distinguishes Shigella and Klebsiella from other members of Enterobacteriaceae?
- Shigella and Klebsiella do not ferment glucose.
- Shigella and Klebsiella are motile bacteria.
- Shigella and Klebsiella are oxidase-positive bacteria.
- Shigella and Klebsiella are nonmotile bacteria. (correct)
Which of the following is a common feature of Enterobacteriaceae?
Which of the following is a common feature of Enterobacteriaceae?
- They are nonmotile bacteria.
- They ferment lactose. (correct)
- They are gram-positive bacilli.
- They are oxidase-positive facultative anaerobes.
What is the most famous medium used for growing Enterobacteriaceae?
What is the most famous medium used for growing Enterobacteriaceae?
Why are many lab media selective for Enterobacteriaceae?
Why are many lab media selective for Enterobacteriaceae?
Which of the following genera are opportunistic pathogens?
Which of the following genera are opportunistic pathogens?
Study Notes
Klebsiella
- Klebsiella is a genus of bacteria in the family Enterobacteriaceae.
- Klebsiella are facultative anaerobic, Gram-negative, rod-shaped bacteria.
Shigella and Klebsiella
- Shigella and Klebsiella are distinguished from other members of Enterobacteriaceae by their inability to ferment lactose.
Enterobacteriaceae
- Enterobacteriaceae are commonly found in the intestinal tract of humans and animals.
- They are facultative anaerobes, rod-shaped, and Gram-negative.
- Enterobacteriaceae are known for their ability to ferment carbohydrates, a feature that is often used to distinguish between different species.
Media for Growing Enterobacteriaceae
- MacConkey agar is a commonly used medium for growing Enterobacteriaceae.
- MacConkey Agar contains bile salts, crystal violet dye, and lactose
- These components are selective for Enterobacteriaceae, which are able to grow even in the presence of these inhibitory substances, while other bacteria are inhibited.
Opportunistic Pathogens
- Several genera of Enterobacteriaceae are opportunistic pathogens, meaning they can cause disease in individuals who are immunocompromised or have underlying health conditions.
- Examples of opportunistic pathogens include Klebsiella, Escherichia, and Proteus.
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Description
Test your knowledge on the characteristics of small gram-negative rods, including their size, motility, oxidase reaction, nitrate reduction, carbohydrate fermentation, and examples of common genera. Learn about the differences between motile and nonmotile strains and their pathogenicity.
