Immunity was maintained at a good level five months after the volunteers were vaccinated.
The statement came from Alexander Gintsburg, director of the National Research Center for Epidemiology and Microbiology named after Gamaleya, a full member of the Russian Academy of Sciences.
"After five months, the state of immunity is good and corresponds to a high level of antibodies, which guarantees the effectiveness of virtually any dose of COVID-19," said Gintsburg.