system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A previously healthy 21-year-old college student is brought to the emergency department because of a 10-hour history of increasing headache, stiff neck, and sensitivity to light. He returned from a mission trip to Haiti 3 weeks ago where he worked in a rural health clinic. He appears lethargic. He is oriented to person, place, and time. His temperature is 39°C (102°F), pulse is 115/min, respirations are 20/min, and blood pressure is 100/70 mm Hg. Examination shows equal and reactive pupils. There are scattered petechiae over the trunk and lower extremities. Range of motion of the neck is decreased due to pain. Neurologic examination shows no focal findings. Blood cultures are obtained and a lumbar puncture is performed. Cerebrospinal fluid (CSF) analysis shows neutrophilic pleocytosis and decreased glucose concentration. Which of the following is most likely to have prevented this patient's condition?
assistant
Polysaccharide conjugate vaccine