| 摘要 |
<p>The invention provides virus vaccines and to a process for the preparation thereof especially to polio virus vaccines and other picorna virus vaccines, such as foot-and-mouth disease vaccine. The invention provides vaccines which are stabilized and show an improved activity by the addition of compounds of formula I < IMG > in which R1 and R2 each represent an alkyl- or alkoxy group of not more than 6 carbon atoms, preferably not more than 4 carbon atoms, A represents a bivalent hydrocarbon radical of 3-12 carbon atoms, R3 represents an unsubstituted or substituted phenyl radical and n is 1 or 0.</p> |
