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Microbiology

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Gram Negative Coccobacilli

Question
15 out of 58
 

Brucella is pathogenic for humans and animals, which one of the following statements best characterizes this organism?



A It cause spontaneous abortion and has tropism for placental tissue due to the presence of erythritol in allantoic and amniotic fluid

B It has a capsule of polyglutamic acid, which is toxic when injected into rabbits

C It has 82 polysaccharide capsular types; capsule is antiphagocytic; type 3 capsule (b-d-glucuronic acid polymer) most commonly seen in injected adults

D It secretes two toxins, A and B, in the large bowel during antibiotic therapy

Ans. A It cause spontaneous abortion and has tropism for placental tissue due to the presence of erythritol in allantoic and amniotic fluid

a. There are no known toxins, hemolysins, or cell-wall constituents known to play a role in the pathogenesis of disease by Brucella. Rather, the ability of the organisms to survive within the host phagocyte and to inhibit neutrophil degranulation is a major disease-causing factor.

b. In infectious abortion of cattle caused by Brucella, the tropism for placenta and the chorion is a function of the presence of erythritol in allantoic and amniotic fluid.

Extra Edge: OIE: Office International des Epizootis.

Gram Negative Coccobacilli Flashcard List

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