Postulated developmental forms in the life cycle of the lymphocystis virus

Electron micrographs of lymphocystis sk8n lesions obtained from the walleye pike, Stizostedion vitreum, show viral particles of differing sizes and morphologies. Earlier studies have described only particles ranging in size from 200-250 mmu in diameter. We show, in addition, new forms (65-100 mmu in diameter) intermingled among the large particles and also contained within the latter. Both forms are associated with a single inclusion body. The possible role of the small particle in the life cycle of the virus is discussed.