The human trial for the indigenously developed Covid-19 vaccine Covaxin has begun at AIIMS Delhi.The All India Institute Of Medical Sciences (AIIMS) was given the go-ahead by its Ethics Committee and has begun the recruitment process for the trial, Guleria said, which will include a total of 100 healthy volunteers between the ages of 18 and 55. In this video understand how the human trail of Covaxin will take place.