Characteristics of participants in the included studies.

Abbreviations: ALS: Amyotrophic Lateral Sclerosis, BMT: Bone marrow transplant, CIDP: Chronic Inflammatory Demyelinating Polyradiculoneuropathy, ED: Emergency department controls, F: Female, HC: Healthy controls, M: Male, NHS: Nurses' health study, NIND: Non-inflammatory neurological diseases, OIND: Other inflammatory neurological diseases, OND: Other neurological diseases, PPMS: Primary progressive MS, Pro: Prospective sample, Retro: Retrospective sample RRMS: Relapsing remitting Multiple sclerosis, SPMS: Secondary progressive Multiple sclerosis.*Median and inter-quartile (IQ) range provided instead of Mean and Standard deviation (SD).‡The Study did not specify what type of anti-EBNA IgG was measured.