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Listerial meningitis. Which patients are vulnerable?

The physician's index of suspicion for infection with Listeria monocytogenes should be elevated if a patient presents with symptoms of meningitis and has impaired cell-mediated immunity. Although diagnosis is aided by detection of an elevated white blood cell count and protein level in the cerebrospinal fluid, it requires isolation of the organism from the cerebrospinal fluid. Appropriate antibiotic treatment leads to recovery in most cases.