Prevalence and duration of BDV antigen markers in patients with major depressive disorder or bipolar disorder during acute depression. Prevalence of three antigen markers, cAg (antigen in PBMCs), pAg (antigen in plasma), and CICs (circulating immune complexes) in representative age- and gender-matched major depressive disorder and bipolar disorder patient cohorts versus healthy controls; for plasma antigen and CIC, the prevalence of patients with large amounts (plasma antigen high, CIC high) is shown separately (data modified from Table 2 in reference 8). Note that only severely depressed patients showed high plasma antigen values.