After global vaccine candidates faced hurdles in their phase-3 trials, experts point out that the sample sizes for clinical trials here for these candidates are too small to establish safety and efficacy. Moreover, leading Indian vaccine candidates are themselves gearing up for large-scale phase-3 trials next year.
Sources in the Central Drugs Standard Control Organisation (CDSCO) said that the Indian regulator will be very careful now when allowing foreign candidates to conduct clinical trials on Indian population.
In fact, the Indian regulator has recently rejected the proposal of Dr Reddy's Laboratories to conduct a phase-3 clinical trial of Russia's Sputnik

)