Correlation between anti-JC-virus and anti-cytomegalovirus, -Epstein-Barr virus and -measles/-rubella/-varicella-zoster-virus antibodies.

Anti-JCV antibody status is used for PML-risk-stratification in MS patients before and during Natalizumab therapy. JCV antibodies can be detected in around 60% of MS patients, however, only a small proportion actually develop PML. As anti-viral antibodies tend to occur unspecifically, the aim of this study was to correlate JCV antibody status and index with other common anti-viral antibodies. A total of 123 samples of MS-patients were tested for anti-JCV antibodies by JCV-Stratify-ELISA at Unilabs, Denmark. The same samples were analyzed for measles, rubella, varicella zoster, EBV, and CMV IgG and IgM antibodies by ELISA, or chemiluminescence-microparticle immunoassay. For all antibody-titers correlations were calculated and group comparisons of JCV-positive and -negative patients were performed. Fifty-three patients (43.1%) were JCV negative and 70 (56.9%) positive. CMV-IgM antibodies were detected in six patients. Otherwise no IgM antibodies were detected. IgG antibodies against measles, rubella, varicella zoster, and EBV were detected in ≥97% of patients and 47 samples (38.2%) tested positive for CMV-IgG. There was no significant correlation between any of the antibody titers including JCV index, however, a significantly higher prevalence (P = 0.003) of CMV-IgG in JCV positive compared to JCV negative patients, whereas no difference was detected for measles, rubella, varicella zoster, and EBV IgG. In conclusion, the JCV antibody response in MS patients seems to be largely independent of any other anti-viral immunity. The only coincidence was found with CMV IgG antibodies which might point towards some immunological cross-reactivity in anti-viral immune response or other mechanisms leading to combined viral infections such as shared transmission. J. Med. Virol. 89:3-9, 2017.