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54) You are working in the emergency department and are called | Paediatrics videos & books

54) You are working in the emergency department and are called to perform a lumbar puncture on a 3-month-old infant who presented with fever and lethargy. The spinal fluid that you obtain is turbid. The laboratory reports that there are 200 WBCs and 5 RBCs per high-power field (HPF). Ninety-five percent of the WBCs in the spinal fluid are neutrophils.
Which of the following is the most probable cause of this illness?