Covaxin has demonstrated protective efficacy and immunogenicity in non-human primates in Phase I clinical trials in India. Covaxin, the indigenously developed Covid-19 vaccine, developed by the ICMR and Bharat Biotech International, is being tested at 12 institutes across India. The results of the first phase of testing are encouraging A two-dose vaccination regimen of inactivated coronavirus vaccine candidates was administered in 20 rhesus macaques (divided into four groups equally). Watch video.