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Mycobacteria Introduction Quiz

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Questions and Answers

Why do mycobacteria leave scars in the lungs even after the body clears the infection?

They are spore-forming bacteria

They replicate rapidly in the lungs

They have a high lipid content in the cell wall (correct)

They are easily cleared by the immune system

Which type of ventilation system is recommended when working with mycobacteria in a lab?

Negative air pressure ventilation (correct)

Positive air pressure ventilation

No ventilation system required

Recirculating ventilation

What characteristic of mycobacteria makes them difficult to stain using the Gram stain technique?

High motility

Presence of interfering cell wall lipids (correct)

Spore-forming ability

Low lipid content in the cell wall

Which type of safety cabinet is recommended for working with mycobacteria in a lab?

Biological safety cabinet Signup and view all the answers

What is the recommended biosafety level (BSL) when processing specimens that may contain mycobacteria?

BSL-2 Signup and view all the answers

What distinguishes Mycobacterium tuberculosis complex from nontuberculous mycobacteria (NTM)?

Their pathogenicity to humans Signup and view all the answers

What is the primary vaccine available for tuberculosis?

BCG vaccine Signup and view all the answers

Why do mycobacteria gram stain poorly?

They have cell wall lipids that block crystal violet penetration Signup and view all the answers

What is the standard time for holding mycobacterial cultures before considering them negative?

6 weeks Signup and view all the answers

Which characteristic describes mycobacteria's growth requirements?

Slow-growing and fastidious Signup and view all the answers

What is the recommended biosafety level for working with cultured mycobacteria organisms?

BSL-3 Signup and view all the answers

Which statement best describes the safety measures required when processing specimens that may contain mycobacteria?

Double seal specimens during centrifugation Signup and view all the answers