This was reported in the Russian defense department.

“Twenty participants in the experiment as part of the second group of volunteers located in the branch of the Main Military Clinical Hospital named after Burdenko, introduced the second component of the vaccine against coronavirus COVID-19,” RIA Novosti reports.

It is noted that "vaccination was carried out in accordance with the plan of clinical trials and the research protocol."

The Ministry of Defense reported that the condition of volunteers after vaccination is good, medical specialists are monitoring them continuously.

The department said that the second component of the vaccine was administered to study participants 21 days after the introduction of the first component.

As explained in the Ministry of Defense, the “booster” vaccination scheme is a double introduction of the same gene on different carriers - it strengthens and enhances protective immunity, increasing the duration of its action.

It is also reported that “the first group of 18 volunteers who evaluated the safety and tolerance of the vaccine during clinical trials ends their participation in clinical trials in two days”, currently “their health is good.”

The department notes that "the obtained data from laboratory and instrumental studies allow us to speak with confidence about the safety and good tolerance of the vaccine."

The Russian Ministry of Defense emphasized that "testing the vaccine on volunteers to avoid subsequent risks of its use is carried out in full accordance with applicable law and the scientific methodology, without any attempt to reduce the duration of the study."

The department added that the information received at the moment “indicates the formation of an immune response in volunteers to the introduction of the vaccine against coronavirus COVID-19."

Earlier it was reported that in Russia the final stage of clinical trials of the vaccine against coronavirus infection COVID-19, which are conducted by the National Research Center named after Gamalei and the Ministry of Defense of Russia.

Russian Defense Minister Sergei Shoigu reported to Russian leader Vladimir Putin that studies on the vaccine against COVID-19 will be completed in late July.