The Role of Varicella Zoster Virus (VZV) in Central Nervous System Infectious Syndromes

Background: We describe the proportion of VZV infection in central nervous system (CNS) infectious syndromes in a single Israeli medical center.Methods: An observational cohort study was conducted in Kaplan Medical Center (a secondary hospital, Israel) between July 1, 2014, and March 31, 2019. Included were adult patients (>= 16 years old) with CNS infection with an aseptic CSF profile that were subjected to molecular tests for herpes viruses, HSV either 1 or 2, VZV, enteroviruses, and IgM for West Nile virus (WNV).Results: Clinical presentation suggestive of CNS infection led to lumbar puncture and CSF analysis in 1500 patients yielding 178 cases with aseptic CSF profile. For 62/109 (55.9%) cases of meningitis, the etiology remained unknown, enterovirus accounted for 21 cases (18.9%), VZV for 16 (14.4%), and HSV 1 for 7 (6.3%). One case each of bacterial, fungal, and parainfluenza virus accounted for the other 3 cases. For 30/63 (47.6%) cases of encephalitis, the etiology remained unknown, HSV accounted for 11 cases (17.5%), VZV for 8 (12.7%), and WNV for 10 (15.9%); in two cases, enterovirus was identified and one case of influenza A and one of mycoplasma, accounted for the rest. In six patients with myelitis VZV was identified in 4 (66.7%). Notably, a typical herpetic rash was identified in only 11/28 (39.28%) of cases of VZV CNS infection.Conclusions: VZV is a significant cause of viral CNS infections. In the majority of patients with neurologic syndrome and evident VZV there is no association with a typical herpetic rash. These results apply to Israeli population and likely to other populations with similar background of VZV past infections.