Electron microscopic observation of African swine fever virus development in vero cells

United States Department of Agriculture, Science and Education Administration, Plum Island Animal Disease Center, Greenport, New York 11944, U.S.A. African swine fever virus emerges from infected Vero cells either from areas of smooth cell surface or from microvilli. The two patterns may occur at different sites on the same cell and are unique for this virus. The scanning electron micrographs supplement regular thin section views. Received 3 February 1978; accepted 23 March 1978.