A 4-year-old girl is brought to the emergency room by her parents. She is lethargic, reports that her head hurts, and shows signs of stiffness in her neck. Her mother states that she has had “a temperature” for the past 2 days; her current temperature determined to be 38 C í. She is admitted to the hospital, where blood is drawn and a lumbar puncture performed. Cerebrospinal fluid and pertinent blood chemistry results follow.