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Questions and Answers
What are the 4 major general characteristics of Enterobacteriaceae?
What are the 4 major general characteristics of Enterobacteriaceae?
- All ferment glucose. 2. All reduce nitrates to nitrites. 3. None produce cytochrome oxidase. 4. All are motile with flagellar arrangement as peritrichous.
Name 3 non-motile enterics within Enterobacteriaceae.
Name 3 non-motile enterics within Enterobacteriaceae.
- Klebsiella 2. Shigella 3. Yersinia
What are the microscopic and colonial morphology characteristics of Enterobacteriaceae?
What are the microscopic and colonial morphology characteristics of Enterobacteriaceae?
Gram-negative, non-spore-forming, facultative anaerobe bacilli
Which culture media have little value in the identification differential of Enterobacteriaceae?
Which culture media have little value in the identification differential of Enterobacteriaceae?
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According to Ewing (1963), what did he propose for classifying the members of the family Enterobacteriaceae?
According to Ewing (1963), what did he propose for classifying the members of the family Enterobacteriaceae?
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Study Notes
Characteristics of Enterobacteriaceae
- The family Enterobacteriaceae has four major general characteristics: Gram-negative, non-spore-forming, rod-shaped, and fermentative.
Motility of Enterobacteriaceae
- Not all Enterobacteriaceae are motile, and three examples of non-motile enterics are Klebsiella, Shigella, and Edwardsiella.
Microscopic and Colonial Morphology
- Enterobacteriaceae are typically 1-5 μm in length, and their colonies are 2-3 mm in diameter, circular, and smooth.
- They may appear as short rods, rods, or even coccobacilli under a microscope.
Culture Media for Identification
- Some culture media, such as MacConkey agar, have little value in the identification differential of Enterobacteriaceae.
Classification of Enterobacteriaceae
- Ewing (1963) proposed a classification system for the members of the family Enterobacteriaceae based on their biochemical reactions, which is still widely used today.
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Description
Test your knowledge of Enterobacteriaceae with this quiz! Learn about their general characteristics, including their ability to ferment glucose and reduce nitrates, as well as their motility and flagellar arrangement. Explore non-motile enterics like Klebsiella, Shigella, and Yersinia, and understand their microscopic and colonial morphology.
