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30 October, 11:51

Janice had been experiencing mild flu-like symptoms before going into premature labor at seven months. The premature baby boy developed complications immediately after birth, running a fever and demonstrating neurologic abnormalities. A cerebrospinal fluid specimen was collected and a gram stain of the specimen showed short Gram-positive bacilli. The CSF culture grew small beta hemolytic colonies that were catalase positive. A CAMP test was positive on this isolate. The same organism grew from blood cultures done on the baby. What is the most likely identification? Multiple Choice O

a. Bacillus anthracis

b. Listeria monocytogenes

c. Streptococcus agalactiae

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Answers (1)
  1. 30 October, 12:07
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    The correct answer is - Listeria monocytogenes.

    Explanation:

    Listeria monocytogenes shows various characteristics that is matching with the provided question that are these are gram positive, motile, non spore forming, rod shaped bacterium that are facultatively anaerobic.

    These baceriums are catalase - positive and oxidase - negative. These rod shaped bacterium shows similar expression like beta hemolysin that can cause destruction of the RBC.

    Thus, the correct answer is - Listeria monocytogenes.

    facultatively anaerobic,

    rod-shaped bacterium

    catalase-positive and

    oxidase-negative, and

    has expression as beta hemolysin, which leads to overall destruction of RBCs
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