Russian scientists have published the first report on their coronavirus vaccine, saying early tests showed signs of an immune response.
The report published by medical journal The Lancet said every participant developed antibodies to fight the virus and had no serious side effects.
Russia licensed the vaccine for local use in August, the first country to do so and before data had been published.
Experts have refuted the authenticity of the report and claimed the trails were too few to guarantee effectiveness and safety.
But Moscow has hailed the results as an answer to critics. Some Western experts have raised concerns about the speed of Russia’s work, suggesting that researchers might be cutting corners.
Last month, president Putin had hailed the vaccine and states that it passed all necessary safety measures. He added as a measure of trust of the vaccine, he had his daughter take it and she had no side effects.