COVID-19 vaccine effectiveness on variants of concern
(Randomized evidence)

If you want to see all variants, please click here

Delta

Forest plots
(last update: 2021-09-03)

Description of primary studies

Trial Type Comparisons Design Participants Sample size Overall risk
of bias
Highest assessment
Full description
Intervention 1 Intervention 2
Alpha
Delta
NCT04641481
Bharat Biotech
Ella R, medRxiv, 2021

Full text
Commentary
Commentary
Inactivated virus

BBV152

Placebo

RCT
Phase 3
Adults with no history of SARS-CoV-2 infection who were healthy or had stable chronic medical conditions at 25 centers in India N=25778
Some concerns
Details

Full description