Meningitis Quiz: Ace Your Exams

Get ready to dominate your medical and nursing exams by using our dynamic quizzes to elevate your knowledge and increase your confidence. Whether you're gearing up for the USMLE®, COMLEX®, or your next in-class assessment, Osmosis quizzes tackle key topics in pathology, diagnostics, and treatment approaches. By honing in on clinical readiness and decision-making, we make sure the knowledge you gain empowers you both in the classroom and in real-world practice. Jump in and supercharge your exam prep!

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A 25-year-old man is brought to the emergency department by his partner following an episode of generalized convulsions. His partner reports that for the past 3 days, the patient has had a high fever and severe headache accompanied by nausea and vomiting. She also mentions that he started complaining of smell and taste changes. A few days ago, they came back from a trip to California in which they hiked and swam in lakes. Temperature is 38.9°C (102°F), pulse is 80/min, and blood pressure is 135/85 mmHg. On physical examination, the patient is confused and unresponsive. Pupils are equal and react sluggishly to light. Brudzinski sign is positive. A lumbar puncture is performed, and cerebrospinal fluid (CSF) analysis shows the following:  

 
 Cerebrospinal fluid 
 Opening pressure  300 mm H2O 
 Protein   130 mg/dL 
 Glucose  20 mg/dL 
 RBCs  Numerous 
 WBC count   1500/µL with polymorphonuclear predominance 
 Neutrophils   80%  

Gram stain of the CSF is negative. Head imaging results are nonspecific. Which of the following is the most likely causative organism?

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