[Comparative characteristics of the physicochemical properties of the vaccinal strain of measles virus L-16 and its Moscow-5 clone].

Certain physical and chemical properties of the measles virus vaccine strain L-16 and its clonal variant M-5 proposed as a duplicate of the vaccine strain were studied. The buoyant density of both viruses in sucrose was 1.18-1.19 g/cm3. Virions were found to contain 6 structural proteins. Electron microscopic examinations revealed no differences in the morphology of virions of the vaccine L-16 strain and M-5 clone.