Atypical mycobacteria and M. leprae Flashcards Preview

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Flashcards in Atypical mycobacteria and M. leprae Deck (6)
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1

why is it called "atypical?"

1. caused neither by TB nor Leprosy
2. environmentally-acquired
3. PPD (purified protein derivative) and TST (tuberculin skin test) usually negative
4. less aggressive infection, not lethal in guinea pigs

2

atypical pneumonia leading to systemic dz is very rare w/o predisposing condition such as

HIV, cancer, old age, infected surgical site, diabetes, and lung dz

3

what are the 4 bugs that cause atypical pneumonia?

1. M. avium-intracellulare
2. M. kansasii
3. M. scrofulaceum
4. M. marinum

4

what are the 2 mycobacterium strains that is considered as group 1, photochoromogens that produce pigment when grown in light?

1. M. kansaii
2. M. marinum

5

what is the mycobacterium that belongs to group 2 which produce pigment when grown in dark or light?

M. scrofulaceum what produced scrofula (refers to a lymphadenitis of the cervical lymph nodes associated with tuberculosis as well as non tuberculous (atypical) mycobacteria.)

6

what is the def of atypical mycobacteria?

environmentally-acquired infections that cause neither TB nor leprosy