"The data was submitted to DCGI following which both these got clearance to start early phase human trials early this month", said Dr Balram Bhargava, DG-ICMR at a daily press briefing here.
"Phase 2 studies of this vaccine are already underway, but it will require larger, phase 3 studies to be completed to determine whether it is effective in preventing COVID-19", Freedman noted.
The director of the Institute for Translational Medicine and Biotechnology Vadim Tarasov confirmed the development to Sputnik news, adding that the first group of volunteers would be discharged on Wednesday and the second on July 20.
Zydus Cadila had said that their vaccine candidate was found to elicit strong immune response in multiple animal species like mice, rats, guinea pigs and rabbits.
"It's a good first step", said Dr William Schaffner, a vaccine expert at Vanderbilt University Medical Center who was not involved in the study. The company had earlier submitted results generated from pre-clinical (animal) studies to get approval to conduct human clinical trials.
As WHO says, there will be no change of the infection in the foreseeable future, a University of Russian Federation claims it has found the vaccine. There were 15 participants in each dose group.
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However, the scientists said more than half of the participants reported fatigue, headache, chills, myalgia or pain at the injection site.
Data on side effects and immune responses at various vaccine dosages informed the doses used or planned for use in Phase 2 and 3 clinical trials of the investigational vaccine.
According to Clinical Trials Arena, the vaccine was tested on small and large animals for toxicity, safety and effectiveness at the Russian Defense Ministry's 48th Central Research Institute.
Positive news about the vaccine comes as states in the south and west are seeing high numbers of new coronavirus cases. "The soonest we will launch industrial production is in the fall, only if all phases of trials go perfectly well".
Based on a list from the World Health Organization, The New York Times reports more than 155 candidate COVID-19 vaccines in development around the world.
Africa could have a Covid-19 vaccine in the first quarter of 2021 if human trials underway in South Africa succeed, says Shabir Madhi, professor of vaccinology at University of Witwatersrand who is leading the local trial.
A total of three doses of the vaccine under trial will be given to the volunteers.