There have been instances of infection among volunteers of Sputnik V trials, the world's first registered vaccine against Covid-19 virus, according to a top official of the developer of the Russian vaccine, said a media report. This is the reason why the developer of the vaccine, the Gamaleya National Research Center for Epidemiology and Microbiology of the Russian Healthcare Ministry, is considering the possibility of disclosing the data on who among the volunteers were administered the vaccine, before summing up the results of the study, Russian news agency TASS reported on Wednesday.

Earlier, Deputy Research Director of the Gamaleya National Research Center, and Associate Member of the Russian Academy of Sciences, Denis Logunov, reported that trial participants will find out whether they received the vaccine or the placebo only after the end of tests. The center's director Alexander Gintsburg reported that the last group of volunteers out of the total of 40,000 may be inoculated by the end of January 2021. "...Apparently, there are (coronavirus) infections (among the post-registration trials participants). At some point in mid-November the provisional results will be summed up, then we will find out the difference between the placebo and the test samples," Gintsburg was quoted as saying to TASS.