It was reported in details that four of the six deceased received a placebo, and two were inoculated with the real drug, according to what Russia Today reported.
It was also announced that one of the participants in the vaccine test group had obesity and atherosclerosis, and died three days after taking the first dose of the drug.
The second volunteer had a heart attack 60 days after the second dose.
Of the participants who received the placebo vaccine, two died as a result of a heart attack and a stroke, while the cause of death of two others is being determined.
Of the six dead, three were over the age of 55.
In total, about 38,000 people over the age of 16 took the exams.
The US Food and Drug Administration had previously confirmed the effectiveness of the Pfizer and Biontech vaccine. The documents said that the drug showed an adequate level of safety, and there were no obstacles to its use in emergency situations.
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