The trials, conducted by the Russian Defense Ministry and the Nikolai Gamaleya Epidemiology and Microbiology Research Center, began in mid-June at a prestigious military hospital in Moscow, with a group of volunteers made up mainly of Russian military personnel, but also by some civilians.
The first group, of 18 volunteers, ended their participation and left the hospital, the Russian Defense Ministry said in a statement on Wednesday.
According to the statement, the main task for this group was to check the safety of the vaccine and the tolerance of the human organism to its components.
The volunteers remained hospitalized for 28 days after the vaccination on June 18, and underwent daily examinations.
During this period, his body's vital functions remained within normal limits, without any serious adverse effects or complications being recorded, the statement said.
A second group of 20 volunteers, who were vaccinated on June 23, is currently in isolation at the hospital under medical supervision, according to the statement.
Clinical trials of this vaccine are due to be completed by the end of July, he adds.
Russia records 746,369 cases of coronavirus and 11,770 deaths from Covid-19, according to official figures on Wednesday.