crista
Forum Guru
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Which one of the following bacteria is deposited directly into the lower airways?
A. Mycoplasma pneumoniae
B. Streptococcus pneumoniae
C. Pneumocystis carinii
D. Hemophilus influenzae
E. Mycobacterium tuberculosis
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| peekay
Forum Guru
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i am thinking about anaerobic bug. best guess would be mycoplasma,may be iam wrong.
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| asmi
Forum Hero
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I too think its mycoplasma
:roll: confusion
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| BOZOK
Forum Newbie
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mycobaterium
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| mistral92
Forum Senior
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it is mycobact tuberculosis.
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| sk
Forum Senior
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The answer is mycobacterium tuber......thats a confirmed answer!...
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| asmi
Forum Hero
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thanks
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| merjr
Forum Junior
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I thought mycobact TB prefered upper lobe??
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| bright_nnn
Forum Senior
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What is the correct answer Crista??? :?:
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| sk
Forum Senior
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Posts: 122
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The answer is mycobacterium tb.....I found the answer at usmleasy.com...
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| dr.shar
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hellow friends, can anyone grade the questions at www.usmleasy.com, plsease give me your opionion about this site. i am unable to decide.
thakingyou. please help me shock shock
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| Idiopathic
Forum Guru
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"merjr" wrote:
I thought mycobact TB prefered upper lobe??
Reactivation/secondary TB does.
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| merjr
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Thanks idiopathic
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| bluestar
Forum Guru
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but I found from pathology textbook that primary TB tends go subpleural while secondary TB tends go to apical/ post. seg of upper lobes? please clarify my confusion
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| merjr
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Primary TB- subpleural caseous granuloma above or below the interlobar fissure andis called the Ghons focus.
Ghons focus+ hilar LN= Ghons complex
and as idiopathic pointed out reactivation or reinfection chooses the upper lobe - Simons focus
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| bluestar
Forum Guru
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so the exact answer to this question is the lesion below the interlobular fissure in primary TB, right? And "subpleural" means close to the pleural, either peripheral of the lung or near the interlobular fissure?
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| merjr
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That's right
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| bluestar
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Thank you very much!
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| mdwannabe
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One thing though... lower airways can be in the apper lobe, or middle, or anywhere... it reffers to the general lung assoc rather than lobes of the lung. The alveolus of the upper lobe is physically above carina, but it is lower airway, while trahea, bronchus and secodary bronchi are upper.
Anyway, TB deposits in lower upper or upper lower lobe-Ghons Focus, extends to hilar nodes-Ghons complex, gets "taken care off" and resides in upper lobe, cavitating and cassaiting in lower airways.
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| Idiopathic
Forum Guru
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This is right, and I thought of it only recently..."lower airways" does not mean lower lung, it could simply mean alveolar duct vs. respiratory bronchiole, etc.
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| xeroorex
Forum Newbie
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The fact that the upper lobes are where the V/Q ratio is high helps me remember that secondary infection occurs there. Plenty of O2 for the aerobic mycobac., and relatively less blood to finish off the mycobac.
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