Clinical Presentation, Diagnosis, and Immediate Management of Meningitis in Elderly Patients

Presentation Differences in Patients ≥ 65 years

The European Society of Clinical Microbiology and Infectious Diseases states that the Kernig sign "does not contribute to the diagnosis of bacterial meningitis" due to its low sensitivity and negative predictive value 4
The sensitivity of the Kernig sign is only 11% in adults, meaning it misses approximately 89% of actual meningitis cases 4
The UK Joint Specialist Societies and ESCMID guidelines emphasize that meningeal signs have inadequate sensitivity for ruling out disease, and therefore, one should never rely on the absence of the Kernig sign to exclude meningitis 4, 5
The combination of cardinal features (fever, neck stiffness, and altered mental status) has a sensitivity of 99-100% for the presence of at least one, effectively eliminating meningitis if all are absent 4, 5

The European Society of Clinical Microbiology and Infectious Diseases recommends that bacterial meningitis should not be ruled out solely on the absence of classic symptoms, as these can be absent even in confirmed cases, with a Grade A recommendation 4
The Infectious Diseases community, as per the Journal of Infection, suggests considering tuberculosis meningitis in patients with subacute presentation, as cranial nerve palsies occur in over one-third of TB meningitis cases 5
The Journal of Infection guidelines recommend recognizing age-related variations, as elderly patients are less likely to have neck stiffness or fever but more likely to have altered consciousness 5
Proceed with cerebrospinal fluid analysis regardless of whether the Kernig sign is present or absent in any patient with suspected meningitis based on clinical presentation (fever, headache, altered mental status, or neck stiffness), as recommended by the European Society of Clinical Microbiology and Infectious Diseases and the Journal of Infection 4, 5