This montage consists of six photomicrographs, each depicting a pocks outbreak on the surface of a chicken chorioallantoic membrane (CAM), after it had been inoculated with a single type of viral organism. Included in this study, were four Orthopoxvirus genus members: Ectromelia virus (ECTV), Gerbilpox virus (GBLV), Raccoonpox virus (RCNV), and Variola virus (VARV), and two members of the genus, Simplexvirus, which included Herpes simplex virus type-1 (HSV-1) and Herpes simplex virus type-2 (HSV-2).
Each species of virus gave rise to a morphologically unique crop of CAM pocks lesions. ECTV gave rise to irregularly edged pocks with accompanying minute satellite pocks. GBLV produced pocks with irregular edges, very similar to those produced by ECTV, minus the smaller satellite pocks. RCNV gave rise to well-demarcated round pocks with relatively crisp borders, and fairly uniform size. VARV produced large round pocks with fuzzy edges. HSV-1 virus gave rise to rounded, or oblong shaped pocks, with fuzzy edges, while HSV-2 virus produced pocks with much clearer edges than those in the case of HSV-1, but also more oblong in shape, like those seen in HSV-1.