1 candidate vaccine has been approved in Russia, however, Russia skipped phase 3 testing, and its safety and efficaciousness in the broad population is currently unknown.

有一种候选疫苗已在俄罗斯获得批准，但是，该疫苗跳过了III期临床试验，目前尚不知道其在广泛人群中的安全性和有效性。

In all of these phases, humans are given the candidate vaccine and others are given a placebo with the goal to help make it easier to compare the efficaciousness of the vaccine.

在试验中，受试者被分为注射候选疫苗的实验组和给安慰剂的对照组，以便比较疫苗的有效性。