COVAXIN shows 77.8% efficacy against symptomatic COVID-19, says Lancet


New Delhi: After WHO’s Emergency Use Approval, here is good news for indigenously developed COVID-19 vaccine COVAXIN.  Global peer reviewed medical journal ‘the Lancet’s peer-review has confirmed that Bharat Biotech’s COVID-19 vaccine, Covaxin, is 77.8 per cent efficient against symptomatic patients, the Hyderabad-based company said on Friday.

“Covaxin is the only COVID-19 vaccine to have demonstrated efficacy data from phase III clinical trials against the delta variant at 65.2 per cent,” the official statement issued by Bharat Biotech said citing the study by the Lancet.


Findings of Lancet study

“Between Nov 16, 2020, and Jan 7, 2021, we recruited 25 798 participants who were randomly assigned to receive BBV152 or placebo; 24 419 received two doses of BBV152 (n=12 221) or placebo (n=12 198). Efficacy analysis was dependent on having 130 cases of symptomatic COVID-19, which occurred when 16 973 initially seronegative participants had at least 14 days follow-up after the second dose. 24 (0·3%) cases occurred among 8471 vaccine recipients and 106 (1·2%) among 8502 placebo recipients, giving an overall estimated vaccine efficacy of 77·8% (95% CI 65·2–86·4). In the safety population (n=25 753), 5959 adverse events occurred in 3194 participants. BBV152 was well tolerated; the same proportion of participants reported adverse events in the vaccine group (1597 [12·4%] of 12 879) and placebo group (1597 [12·4%] of 12 874), with no clinically significant differences in the distributions of solicited, unsolicited, or serious adverse events between the groups, and no cases of anaphylaxis or vaccine-related deaths” read the Lancet report.


BBV152 was highly efficacious against laboratory-confirmed symptomatic COVID-19 disease in adults. Vaccination was well tolerated with no safety concerns raised in this interim analysis.

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