Figure 1 (Top) Morphology of virions of white spot syndrome virus (WSSV). (Left) Schematic illustration of the structure of a typical whispovirus virion. (Top center and right) Negative contrast electron micrographs of WSSV virions (center, courtesy of Marielle van Hulten) and nucleocapsids (right, courtesy of Don Lighter) from hemolymph of infected Penaeus monodon. The bars represent 100 nm. (Bottom left) Thin section of WSSV-infected stomach epithelium showing the parallel arrangement of virions in the nucleoplasm (the bar represents 1 µm) and (bottom right) a cross-section of virions (the bar represents 1 µm)
(courtesy of Don Lightner).
Figure 2 Schematic map of the circular dsDNA white spot syndrome virus type strain CN (WSSV-CN) genome showing the genomic organization. The solid arrows indicate the positions and direction of transcription of corresponding genes. The G at the start (GGATCC) of the largest BamHI fragment is designated position 1.
Figure 3 Cladogram based on genetic distances between aa sequences derived from the DNA polymerase gene of WSSV and a number of other large DNA viruses, as well as two mammalian representatives.