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Questions and Answers
What is the Runyon group for classification of mycobacteria?
What is the Runyon group for classification of mycobacteria?
- I (correct)
- II (correct)
- IV (correct)
- III (correct)
What is the characteristic of Runyon group I?
What is the characteristic of Runyon group I?
Photochrome
What is the pathogenicity of Runyon group I?
What is the pathogenicity of Runyon group I?
Pathogenic
Name an example of a mycobacterium in Runyon group I.
Name an example of a mycobacterium in Runyon group I.
What is the characteristic of Runyon group II?
What is the characteristic of Runyon group II?
Runyon group II mycobacteria are pathogenic.
Runyon group II mycobacteria are pathogenic.
Name an example of a mycobacterium in Runyon group II.
Name an example of a mycobacterium in Runyon group II.
What characterizes Runyon group III?
What characterizes Runyon group III?
Name an example of a mycobacterium in Runyon group III.
Name an example of a mycobacterium in Runyon group III.
What is the characteristic of Runyon group IV?
What is the characteristic of Runyon group IV?
Name an example of a mycobacterium in Runyon group IV.
Name an example of a mycobacterium in Runyon group IV.
How do Runyon groups I-III compare to group IV in terms of growth speed?
How do Runyon groups I-III compare to group IV in terms of growth speed?
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Study Notes
Mycobacteria Classification: Runyon Group
- Mycobacteria are classified into the Runyon grouping system with four main groups (I-IV).
Runyon Group I
- Characteristics: Photochromes; produce a yellow-orange pigment when exposed to light.
- Pathogenicity: Pathogenic.
- Examples: Mycobacterium kansasii, Mycobacterium marinum.
Runyon Group II
- Characteristics: Scotochromogens; produce a yellow-orange pigment regardless of light exposure.
- Pathogenicity: Non-pathogenic.
- Example: Mycobacterium gordonae.
Runyon Group III
- Characteristics: Nonchromogens; do not produce any pigment.
- Examples:
- MTB complex: Mycobacterium tuberculosis (M.tb), Mycobacterium bovis (M.bovis).
- MAI complex: Mycobacterium avium (M.avium), Mycobacterium intracellulare (M.intracellulae).
Runyon Group IV
- Characteristics: Rapid growers and nonchromogenic.
- Examples: Mycobacterium fortuitum, Mycobacterium chelonae.
Comparison of Groups
- Group I-III: Characterized as slow growers.
- Group IV: Identified as rapid growers.
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