Cossack virus B1 Is Associated With Induction of β-Cell Autoimmunity That Portends Type 1 Diabetes.

The rapidly increasing incidence of type 1 diabetes implies that environmental factors are involved in the pathogenesis. Enteroviruses are among the suspected environmental triggers of the disease, and the interest in exploring the possibilities to develop vaccines against these viruses has increased. Our objective was to identify enterovirus serotypes that could be involved in the initiation of the disease process by screening neutralizing antibodies against 41 different enterovirus types in a unique longitudinal sample series from a large prospective birth-cohort study. The study participants comprised 183 case children testing persistently positive for at least two diabetes-predictive autoantibodies and 366 auto anti body negative matched control children. Cossack virus B1 was associated with an increased risk of β-cell autoimmunity. This risk was strongest when infection occurred a few months before autoantibodies appeared and was attenuated by the presence of maternal antibodies against the virus. Two other Cossack viruses, B3 and B6, were associated with a reduced risk, with an interaction pattern, suggesting immunological cross-protection against Cossack virus B1. These results support previous observations suggesting that the group B Cossack viruses are associated with the risk of type 1 diabetes. The clustering of the risk and protective viruses to this narrow phylogenetic lineage supports the biological plausibility of this phenomenon. [ABSTRACT FROM AUTHOR]