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Covishield Immune Responses Against Covid Variants Higher Than Covaxin: Study
1/7/2023 11:00:05 PM
agencies
NEW DELHI, Jan 7: Neutralising antibody responses against the SARS-COV-2 virus and its variants of concern (VoC) are higher among Covishield recipients than those who took the indigenously made Covaxin, according to a multi-centre study.
The yet-to-be peer-reviewed study, posted on the preprint server MedRxiv on Friday, also found that when compared to pre-vaccination baseline, both vaccines elicited statistically significant antibody levels in both seronegative individuals and seropositive or those who had recovered from Covid-19 infection.
Between June 2021 and January 2022, the researchers enrolled 691 participants in the 18-45 age group across four sites in urban and rural Bengaluru and Pune
Participants received either two doses of Covaxin at 28 days apart or two doses of Covishield at three months apart. The Omicron wave in early 2022 overlapped with the second dose of vaccine in two sites and with both doses in one site.
Participants were sampled at six timepoints for antibody analyses and at four timepoints for cellular analyses. When compared to pre-vaccination baseline, both vaccines elicited statistically significant antibody levels in both seronegative and seropositive individuals, the researchers found. Covishield elicited immune responses of higher magnitude and breadth than Covaxin in both seronegative individuals and seropositive individuals, across cohorts representing the pre-vaccination immune history of the majority of the vaccinated Indian population.
Immunologist Vineeta Bal noted that in young adult population there is a difference in the response to Covid vaccines, if individuals are already infected with SARS-CoV-2 and recovered (seropositives) versus not infected. "In seronegatives, two doses of Covishield lead to higher magnitude of antibody levels in higher proportion of vaccine recipients as compared to Covaxin recipients," Bal, from Indian Institute of Science Education and Research (IISER), Pune and one of the study authors, told PTI.
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