Wound tumor virus is an invertebrate and plant virus found in the United States of America belonging to the genus Phytoreovirus and the family Sedoreoviridae. It is a type III virus under the Baltimore classification system; that is it has a double-stranded RNA genome. This genome is approximately 25,000 base pairs long and organised into twelve segments. All the viral replication occurs in the cytoplasm. The virus is 22% RNA by weight, the other 78% being structural proteins.