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Mycobacteria Classification Flashcards

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Questions and Answers

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?

Photochrome

What is the pathogenicity of Runyon group I?

Pathogenic

Name an example of a mycobacterium in Runyon group I.

M.kansaii or M.marinum Signup and view all the answers

What is the characteristic of Runyon group II?

Scotochromogens Signup and view all the answers

Runyon group II mycobacteria are pathogenic.

False Signup and view all the answers

Name an example of a mycobacterium in Runyon group II.

M.gordonae Signup and view all the answers

What characterizes Runyon group III?

Nonchromogenes Signup and view all the answers

Name an example of a mycobacterium in Runyon group III.

MTB complex or MAI complex Signup and view all the answers

What is the characteristic of Runyon group IV?

Rapid growers and nonchromogenic Signup and view all the answers

Name an example of a mycobacterium in Runyon group IV.

Mycobacterium fortuitum or Mycobacterium chelonae Signup and view all the answers

How do Runyon groups I-III compare to group IV in terms of growth speed?

Slow growers Signup and view all the answers

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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Description

Explore the classification of mycobacteria with these flashcards focusing on the Runyon group. Each card provides key information on the different categories and characteristics of mycobacteria. Perfect for students studying microbiology.