To the Editor.—We have read with interest the article by Behrman and associates'1 concerning central nervous system infections in elderly patients, which has been published in the July 1989 issue of the Archives. We would like to add some comments with respect to the prognostic factors in elderly patients with acute bacterial meningitis.
From 1974 to 1988, 291 adult patients (aged 15 years or more) with acute bacterial meningitis have been cared for at the Hospital de la Santa Creu i Sant Pau, Barcelona, Spain. Fifty-nine of these patients (20.27%) were aged 65 years or more. There were 26 men and 33 women. The mean age of the group was 71.4±5.72 years (range, 65 to 87 years). Twenty-six patients (44%) had underlying diseases predisposing them for acquiring acute bacterial meningitis. An etiologic diagnosis could be made in 50 (84.7%) patients. Nineteen patients (32.2%) had a pneumococcal meningitis, 11