2021
DOI: 10.1101/2021.08.04.21261601
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Booster and anergic effects of the Covishield vaccine among healthcare workers in South India

Abstract: Covishield (same as ChAdOx1) vaccine was rolled out in January 2021 against SARS-CoV2 in India. Although studies show good efficacy after two doses, there is limited data on the fate of the elicited antibody responses over time in groups with or without prior exposure to SARS-CoV2. Therefore, in this study we proposed to test naïve or previously exposed healthcare workers (HCWs) longitudinally after both doses for anti-SARS-CoV2 spike antibody (ASSA) levels. Serum samples were collected from 205 HCWs at days 1… Show more

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Cited by 2 publications
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“…Nucleocapsid antibodies are known to decay with a half-life of 68 days 17 and 59% of our study participants were positive for N antibodies suggesting that they could have been infected with SARS-CoV-2 within the past 6-8 months. Therefore, we cannot rule out the possibility that some of the subjects with high antibody titers were in their early convalescence and therefore, the boosting effect may not have been significant due to 11 anergy of the immune system as has been observed in other studies 18 . Antibody boosting correlated negatively with the levels of pre-existing antibodies which indicates that a strategy is needed to prioritize high-risk individuals based on their antibody levels for booster vaccination.…”
Section: Resultsmentioning
confidence: 88%
“…Nucleocapsid antibodies are known to decay with a half-life of 68 days 17 and 59% of our study participants were positive for N antibodies suggesting that they could have been infected with SARS-CoV-2 within the past 6-8 months. Therefore, we cannot rule out the possibility that some of the subjects with high antibody titers were in their early convalescence and therefore, the boosting effect may not have been significant due to 11 anergy of the immune system as has been observed in other studies 18 . Antibody boosting correlated negatively with the levels of pre-existing antibodies which indicates that a strategy is needed to prioritize high-risk individuals based on their antibody levels for booster vaccination.…”
Section: Resultsmentioning
confidence: 88%