Bharat Biotech Asked To Give Phase-2 Data Before Phase-3 Trial Of Covid-19 Vaccine
A pharmacist holds a shot of vaccine in U.S. (Photographer: Marco Bello/Bloomberg)

Bharat Biotech Asked To Give Phase-2 Data Before Phase-3 Trial Of Covid-19 Vaccine


The government has asked Bharat Biotech to submit complete safety and immunogenicity data of the ongoing phase-2 trial, besides providing some clarifications, before it proceeds for the next stage.

Bharat Biotech had sought the Drug Controller General of India’s nod for conducting phase-3 clinical trials of its Covid-19 vaccine candidate - ‘Covaxin.’

‘Covaxin’ is being indigenously developed by the company in collaboration with the Indian Council of Medical Research (ICMR).

According to officials, the Hyderabad-based vaccine maker applied to the DCGI on October 2, seeking its permission to conduct phase-3 randomised, double-blind, placebo-controlled trial of the vaccine.

Bharat Biotech in its application said that the study would cover 28,500 individuals, who are aged 18 years and above. The study would be conducted in 19 cities, including Delhi, Mumbai, Patna and Lucknow across 10 states.

According to sources, the phase-2 trial of the Covaxin is going on and the second dose is yet to be given to volunteers at some sites. “The company presented phase-3 clinical trial protocol along with interim data of phase 1 and 2 clinical trials,” an official said.

The subject expert committee at the Central Drugs Standard Control Organisation deliberated on the application on October 5. “After a detailed deliberation, the committee opined that the design of the phase-3 study is in-principle satisfactory, except for clarification on the definition of asymptomatic.

“However, the study should be initiated with appropriate dose identified from the phase-2 safety and immunogenicity data. Accordingly, the firm should submit safety and immunogenicity data from phase-2 trial for consideration,” the panel said in its recommendations.

The expert committee during its discussion also observed that the vaccine was well-tolerated in all dose groups and no serious adverse events have been reported so far, a source said. The most common adverse event was pain at the injection site, which resolved transiently, the source said.

The phase-3 clinical trial application proposed a dose of 0.5 ml on day 0 and 28, sources said. Besides, Bharat Biotech, indigenously developed vaccine candidate by Cadila Healthcare Ltd., is in phase 2 of the human clinical trials.

The Pune-based Serum Institute of India, which has partnered with AstraZeneca for manufacturing the Oxford Covid-19 vaccine candidate, is also conducting Phase 2 and 3 human clinical trials in India.

Also read: India Vaccine Maker Reverses Course, Stops Testing Astra Shots

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