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Bhatnagar T, Chaudhuri S, Ponnaiah M, Yadav PD, et al. Effectiveness of BBV152/Covaxin and AZD1222/Covishield vaccines against severe COVID-19 and B.1.617.2/Delta variant in India, 2021: A multi-centric hospital-based case-control study. Int J Infect Dis 2022 Jul 14. pii: S1201-9712(22)00427.
PMID: 35843496


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