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Flashcards in mycobacteria Deck (3)
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1

characteristics of mycobacteria

slow growing (divide once q 24 hrs)
hard to grow in culture
mycolic acid in cell envelope → acid-fast stain (stain not removed by acidified alcohol)
airborne transmission: need negative pressure rooms + N95 masks for protection

2

positive PPD test demonstrates

active of latent TB infection
history of BCG vaccine
infection with nontuberculous mycobacterium

3

negative PPD test demonstrates

TN: no TB but may have conditions that resemble TB (sarcoidisis, nontuberculous mycobacteria)
FN: immunosuppresive meds (steroids), immunocompromised host (elderly, cancer, HIV)

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