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Microbiology

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Rickettsia and Chlamydia

Question
21 out of 42
 

A 16-year-old girl presents with a painless enlarged lymph node in her right axilla. Peripheral blood counts are within normal limits. The lymph node is biopsied, and numerous granulomas filled with neutrophils and necrotic debris are observeD. Which organism could produce this disease?



A Bartonella henselae
B Borrelia burgdorferi

C Chlamydia psittaci
D Coxiella burnetii

Ans. A Bartonella henselae

a. This is the history of cat-scratch disease due to B. henselae. B. henselae is a gram negative bacillus, which also causes bacillary angiomatosis in immunocompromised patients (HIV/ AIDS).

b. Cat scratch disease manifests as a papule at the site of cat bite/ scratch associated with localized lymphadenopathy.

c. Other species of bartonella: B. quintana causes trench fever and vector is louse; B. bacilliformis causes oroya fever or verruga peruana and vector is sand fly.

Rickettsia and Chlamydia Flashcard List

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