METHOD OF PRODUCING VACCINE AGAINST RUSSIAN TICK-BORNE ENCE PHALITIS

摘要

Meningo-encephalitis virus (TBE-virus) vaccines are produced by culturing the virus in tissued cultures or in suspensions of avian embryo cells, separating the cells and cell debris by centrifugation, inactivating and concentrating the virus, purifying the suspension containing the virus by subjecting it to a continuous flow density gradient ultracentrifugation in which the gradient content is divided into fractions and the fractions exhibiting an increased absorbance at 260 nm and containing particles with a sedimentation constant in the range of 200 S are collected, and processing the purified suspension into vaccines.