The International Vaccine Institute (IVI), an international organization dedicated to the discovery, development and delivery of safe, effective and affordable vaccines, will conduct the Phase 3 clinical trial in Nepal, expecting to enroll 4,000 volunteers across 3 study sites in the country.

Sanofi and GSK received approval for their Phase 3 clinical study in Nepal to assess the safety, efficacy and immunogenicity of their adjuvanted recombinant-protein COVID-19 vaccine candidate.

In addition to generating local data to support the global clinical trial, this Phase 3 study led by IVI will continue to build capacity and infrastructure for vaccine research and development in Nepal.

As COVID-19 vaccination becomes available, study participants are encouraged to receive an approved COVID-19 vaccine during the study, if they wish to do so. As part of the study design, all participants including the control group will be offered the study vaccine as soon as it is determined to be safe and effective.

“Nepal is participating in Sanofi Pasteur’s pivotal Phase 3 study, and we have begun enrollment of study participants in the country. We have partnered with International Vaccine Institute for the study in Nepal,” said Annapurna Das, Country Head, Sanofi Pasteur India and South Asia.

“As the virus continues to evolve, we are anticipating what will be needed in the coming months and years, and accordingly, have adapted our vaccine development program. We believe our COVID-19 adjuvanted, recombinant vaccine can make a significant contribution to the ongoing fight against COVID-19 and are committed to initiating our clinical program in Nepal, at the earliest” she added.

“Achieving global immunity to end the COVID-19 pandemic requires an innovative generation of new vaccines that have been tested against circulating variants and that will be accessible to low-resource settings. We are pleased to partner with Sanofi Pasteur on this pivotal Phase 3 study in Nepal, particularly in light of our recent collaboration agreement with the Nepal Health Research Council earlier this year to strengthen public health in the region,” said Dr Anh Wartel, Deputy Director General at IVI.


In a two-stage approach, the study will initially investigate the efficacy of a vaccine formulation targeting the original virus strain (D.614), while a second stage will evaluate a second formulation targeting the Beta variant (B.1.351).

Recent scientific evidence shows that antibodies created against the Beta variant may provide broad cross-protection against other more transmissible variants.

The design of the Phase 3 study, conducted across a broad diversity of geographies, also allows evaluation of the efficacy of the candidate against a variety of circulating variants.

Sanofi and GSK will also run clinical studies to assess the ability of the adjuvanted recombinant-protein COVID-19 vaccine candidate to generate a strong booster response regardless of the type of vaccine initially received.

The Phase 3 study initiation follows the global interim Phase 2 results which showed that the adjuvanted recombinant COVID-19 vaccine candidate achieved high rates of neutralizing antibody responses in all adult age groups, with 95 to 100% seroconversion rates.

After a single injection, high neutralizing antibody levels were also generated in participants with evidence of prior SARS-CoV-2 infection, suggesting strong potential for development as a booster vaccine.