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

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

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.