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‘Covaxin demonstrates overall interim clinical efficacy of 78%’

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Hyderabad, April 21, 2021-
Leading vaccine maker Bharat Biotech and the Indian Council of Medical Research (ICMR) on Wednesday announced interim results from phase 3 clinical trials of Covaxin, which show 78 per cent overall clinical efficacy and 100 per cent efficacy against severe Covid-19.

The second interim analysis is based on accruing more than 87 symptomatic cases of Covid-19. Due to the recent surge in cases, 127 symptomatic cases were recorded, resulting in a point estimate of vaccine efficacy of 78 per cent against mild, moderate, and severe Covid-19 disease.

The efficacy against severe Covid-19 disease was 100 per cent, with an impact on reduction in hospitalizations. The efficacy against asymptomatic Covid-19 infection was 70 per cent, suggesting decreased transmission in Covaxin recipients.

Safety and efficacy results from the final analysis will be available in June, and the final report will be submitted to a peer-reviewed publication, Hyderabad based Bharat Biotech said.

Based on the achievement of the success criteria, placebo recipients have now become eligible to receive two doses of Covaxin.

The phase 3 study enrolled 25,800 participants between 18-98 years of age, including 10 per cent over the age of 60, with the analysis conducted 14 days post the 2nd dose.

Covaxin was developed with seed strains received from the National Institute of Virology, and the phase 3 clinical trial was co-funded by the ICMR.

“Efficacy against SARS-Cov-2 has been established. Covaxin has demonstrated an excellent safety record in human clinical trials and in usage under emergency use. Covaxin is now a global innovator vaccine derived from research and development from India. The efficacy data against severe Covid-19 and asymptomatic infections is highly significant, as this helps reduce hospitalizations and disease transmission, respectively,” said Dr Krishna Ella, Chairman & Managing Director, Bharat Biotech.

“The protocols for manufacturing, testing and release of inactivated vaccines have been tried, tested and validated across several of our vaccines; these also meet the requirements of WHO, Indian and other regulatory authorities. These protocols have delivered consistent results over a 15-year period with more than 300 million doses supplied globally, with excellent safety and performance record,” he added.

“I am very pleased to state that Covaxin, the first indigenous COVID-19 vaccine developed by ICMR and BBIL, has shown the efficacy of 78% in the second interim analysis. The tireless efforts of our scientists at ICMR and BBIL have resulted in a truly effective international vaccine of the highest standards and efficacy. I am also happy to note that Covaxin works well against most variants of SARS-CoV-2. These findings together consolidate the position of our indigenous vaccine in the global vaccine landscape,” said Prof Balram Bhargava, Secretary Dept. of Health Research & Director General, Indian Council of Medical Research.

Several million doses of Covaxin have been supplied and administered in India and several other countries with an excellent safety record, evident by the minimal or lack of adverse events post-immunization. It was approved and introduced initially through Emergency Use Authorization under the clinical trial mode, resulting in robust safety data in real-life conditions.

The company said its efforts to further develop Covaxin continue with clinical trials planned in India and globally to evaluate its safety and immunogenicity in younger age groups, the impact of booster doses, and protection against SARS-CoV-2 variants.

Suchitra Ella, Joint Managing Director, Bharat Biotech, said Covaxin’s’s evidence-based development has proved its suitability for global access, with excellent efficacy results against symptomatic, asymptomatic, and severe disease. “The interest from countries worldwide has quietly validated our efforts. We thank our volunteers, principal investigators, partners and team Bharat Biotech for their contribution to this project towards improving global public health,” she said.

Bharat Biotech said more than 60 countries globally have expressed their interest in Covaxin. These countries are highly satisfied with the safe, inactivated vaccine technology and robust data package for safety and immunogenicity across the whole SARS-CoV-2 virus. Emergency Use Authorizations have been received from several countries.

The company’s development efforts have been transparent and published in 6 peer-reviewed journals, with additional publications in process.

The capacity expansion has been implemented across multiple facilities in Hyderabad and Bengaluru to reach approximately 700 million doses per year, one of the largest production capacities for inactivated viral vaccines worldwide. (Agency)

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