COVID-19 vaccine | Phase-III trials for Bharat Biotech’s Covaxin see 70-80% refusal rate from volunteers: Report

Dr Sanjay Rai, Professor of Community Medicine at AIIMS and a principal investigator for the Covaxin trial says motivation to participate is lost as people feel that a vaccine has already been found.

Phase III trials for Covaxin are hoped to be completed by December-end (File Image: Covaxin - Bharat Biotech)

Phase-III trials for Bharat Biotech’s COVID-19 vaccine candidate Covaxin are facing a shortage of volunteers with a participant refusal rate of up to 70-80 percent, a senior doctor with the All India Institute of Medical Sciences (AIIMS) in Delhi told ANI on December 16.

Dr Sanjay Rai, Professor of Community Medicine at AIIMS and a principal investigator for the Covaxin trial said motivation to participate has been lost as people feel that a vaccine has already been found, the report said. He added that Phase I and II of the trials had zero refusal rate.

Explaining the dwindling interest, Dr Rai said Phase I had 4,500 applicants for 100 volunteer spots, Phase II had 4,000 volunteers for 50 spots, while Phase III which requires 1,500-2,000 participants managed to recruit only 200 participants.

“This is happening because people are thinking ‘why to volunteer when a vaccine is coming for everyone soon?’,” he added. He said that excitement has shifted from clinical trials towards the vaccine."As per the central government’s guidelines, vaccines will only be administered to priority groups in the first phase. Fact is that, even if a vaccine comes, it'll be given to healthcare providers, frontline workers, elderly and those with co-morbidities first. But people think they will get vaccine soon," he pointed out.

Another reason for refusal, Dr Rai said, was that participants were reluctant because half of them would be administered placebo and won't know whether they are part of the vaccine group or placebo group.“Most participants refuse after listening to this saying that a vaccine is coming soon. We are now planning to create awareness among people through ads, email and telephone. It’s important for people to participate in the clinical trial to get a safe and efficient vaccine," he stated.

He added that they hope to complete Phase III trials by December-end.