According to a new research, the vaccination efficacy of Covishield against COVID-19 infection in fully vaccinated persons was shown to be 63% during April and May, when the second wave was at its height in India.
It was published in the journal ‘The Lancet Infectious Diseases’ and featured a comparison of 2,379 confirmed SARS-CoV-2 infections and 1,981 controls.
The vaccine’s efficacy against SARS-CoV-2 infection was reported to be 63% in completely vaccinated persons.
The Science and Technology Ministry shared the study in an official statement.
“More importantly, the scientists also observed that the spike-specific T-cell responses were conserved against both the delta variant and wild-type SARS-CoV-2. Such cellular immune protection might compensate for waning humoral immunity against the virus variants and prevent moderate-to-severe disease and need for hospitalisation,” the study said.
The ministry said this study provides comprehensive data on the real-world vaccine effectiveness and immunological response to vaccination which should help guide policy.
A multi-institutional team of Indian researchers led by Translational Health Science and Technology Institute (THSTI) evaluated the real-world vaccine effectiveness of Covishield during the SARS-CoV-2 infection surge between April and May, 2021, in India.
They also assessed neutralising activity and cellular immune responses against the variants in healthy vaccinated persons to understand the mechanisms of protection.
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