Abstract:
Electron microscope studies on the three ephemeral fever virus (EFV) strains EFVl, EFV13 (South Africa) and Japanese bovine epizootic fever (BEF) virus (Strain YHK) showed that the normally cone-shaped South African EFV, may, under certain circumstances, appear bullet-shaped while the Japanese EFV which is usually bullet-shaped may appear as a cone. These findings suggest that ephemeral fever virus is pleomorphic.
