Figure 4From: Comparison of the sensitivity of a 24 h-shell vial assay, and conventional tube culture, in the isolation of Herpes simplex virus – 1 from corneal scrapingsShell vial culture positive for HSV-1. Note the presence of HSV-1 infected cells (stained dark brown). Uninfected cells appear bluish purple due to counterstaining with haematoxylin. Indirect immunoperoxidase assay, × 500.Back to article page