The studies prove that blood type plays a major role in a person's susceptibility to infection and their chance of having a severe bout of the disease.
The vaccine has been approved despite the results of early-stage testing of EpiVacCorona not published. Russia is likely to approve its third vaccine by December.
Researchers who conducted the study said that if the novel Coronavirus is anything like the SARS virus, the antibodies could last for at least two years
COVAX is being co-led by Gavi, the Coalition for Epidemic Preparedness Innovations (CEPI) and the WHO and aims to make the coronavirus vaccine accessible to all countries