Covid-19 crisis: Health care workers may get vaccine after phase 2 trials

India may look at compassionate use of the Covid-19 vaccine for its front line workers after human trials pass phase 2. 

Indigenously developed Bharat Biotech’s vaccine candidate Covaxin is entering human trials on Wednesday. 

Industry sources say more vaccines may enter human trials in July. 

The vaccine completing phase 3 clinical trials and getting marketing approval is at least a year away, say experts.  Phase 1 trials, which test primarily the toxicity of a vaccine candidate on a small population, usually take a month or so, and phase 2 trials, which look at efficacy and determine the dosage, may take around six months. 

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