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Medicine

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Respiratory

Question
2 out of 20
 

Which of the following is the most infective form of TB



A Cavitary lesion
B Endobronchial

C Laryngeal tuberculosis
D Extra pulmonary

Ans. A

Cavitary lesion

Infectivity (in decreasing order)

Cavitary lesion, endobronchial/ laryngeal tuberculosis > smear negative > culture negative > extra pulmonary

Extra Edge: Cavernous breathing is heard in a cavity. (LQ)

Extra Edge: Pathogenesis (Ref. Hari-18th ed., Pg- 1342)

2 – 4 weeks after infection two host response develop –

1). Tissue damaging response – Result of delayed type hypersensitivity reaction to bacillary antigen. It destroys non activated macrophages that contain multiplying bacilli.

2). Macrophage – activating response – It results in the activation of macrophages that are capable of killing and digesting tubercle bacilli.

Respiratory Flashcard List

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