The Lancet has now published Phase 2 clinical trial results of Bharat Biotech’s Covaxin (codenamed BBV152).
Earlier, Bharat Biotech and the Indian Council of Medical Research (ICMR) announced that India’s first indigenous Covid-19 vaccine has shown an interim efficacy of nearly 81%.
The results of the study titled ‘Safety and immunogenicity of an inactivated SARS-CoV-2 vaccine, BBV152L interim results from a double-blind, randomised, multicentre, phase-2 trial and 3-month follow-up of a double-blind, randomised phase 1 trial’ were published in the peer-reviewed British journal on Tuesday.
“BBV152 led to enhanced immune responses and induced T-cell responses that were biased to Th1. Due to the difference in dosing regimens between Phase 1 (two doses given 2 weeks apart) and phase 2 (two doses given 4 weeks apart) trials, neutralisation responses were significantly higher in the phase 2 trial than in the phase 1 trial, said the research paper published in Lancet.
Interestingly, the proportion of participants reporting adverse events in the phase 2 trial were lower than in the phase 1 trial.
No immunological differences between men and women and across age groups were observed by the study.
The study said that both the groups that were administered the vaccine (3 ug with Algel-IMDG and 6 ug with Algel-IMDG) having similar safety outcomes.
The researchers led by ICMR director general Balram Bhargava and Raches Ella, project lead: SARS-CoV-2 vaccine and head of business development & advocacy, Bharat Biotech also said that the follow-up data from the phase 1 trial shows that BBV152 induces durable humoral and cell-mediated immunity at three months after the second dose (day 104) of the vaccine.