The vaccine efficacy is much lower than many of our other childhood vaccines.

这款疫苗的效力远远低于许多其他儿童疫苗的效力。

If there are no significant negative side effects and there's evidence of vaccine efficacy, the vaccine can move to clinical trials.

如果没有发现明显的不良反应且可以证明疫苗的有效性，该疫苗便可被应用于下一步的临床试验中。

The overall vaccine efficacy in the older age group for all the sites was 47 percent and in the younger age it was 27 percent.

在老年人群中整体疫苗功效为47%, 年轻人则是27%。

However, as few people over 60 years old were enrolled in clinical trials, the WHO says the Sinovac vaccine's efficacy can not be estimated in this age group.

然而，世卫组织表示，由于较少有60岁以上人群参加临床试验，无法预计科兴疫苗在这个年龄组的有效性。