Impaired functioning in euthymic patients with bipolar disorder--HSV-1 as a predictor.

There is a possible association between infectious agents and psychiatric disorders. Previous studies in the US provided evidence for cognitive impairment correlated with Herpes simplex virus type 1 (HSV-1) infection. For a replication study in Europe we chosed individuals diagnosed with bipolar disorder to analyse the correlation with HSV-1 infection.