Community-Acquired Meningitis in HIV-Infected Patients in the United States

We conducted a retrospective study of 549 adults admitted with community-acquired meningitis (CAM) to several hospitals in New Orleans, LA and Houston, TX between 1999 and 2014 to characterize the current epidemiology, clinical manifestations, cerebrospinal fluid (CSF) characteristics, and outcomes of CAM between HIV-infected and uninfected patients and to identify risk factors for adverse outcomes in CAM. Bivariate analysis and logistic regression analysis were used to identify prognostic factors. A total of 1022 patients with CAM were screened. Only 549 (53.7%) subjects had an HIV test and were included in the study. Of those, 138 (25%) had HIV infection. HIV-infected patients presented with less meningeal symptoms (headache, neck stiffness, and Kernig sign), but with higher rates of hypoglycorrhachia, elevated CSF protein, and an abnormal cranial imaging (p < 0.05). More than 50% of all the patients had an unknown etiology. Cryptococcal meningitis was the most common identified etiology of CAM in HIV-infected patients followed by neurosyphilis and varicella-zoster virus (VZV). Viral and bacterial etiologies were the most frequent etiologies in non-HIV-infected patients. Streptococcus pneumoniae was the most common bacterial pathogen in both groups, but it was rare overall (2%). Adverse clinical outcomes were similar in both groups (27% vs. 24%). Logistic regression identified hypoglycorrhachia and an abnormal neurological examination as independent predictor factors of worse outcome in all patients with meningitis. Our results demonstrate that the etiology, clinical presentation, and CSF findings differ between HIV-infected and HIV-uninfected adults with CAM, but clinical outcomes are similar.