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Initial SARS-CoV-2 vaccination response can predict booster response for BNT162b2 but not for AZD1222 (preprint)
medrxiv; 2021.
Preprint in English | medRxiv | ID: ppzbmed-10.1101.2021.07.06.21260059
ABSTRACT
Objectives Our objective was to determine whether SARS-CoV-2 antibody levels after the first dose can predict the final antibody response and whether this is dependent on the vaccine type. Methods 69 BNT162b2 (Pfizer/BioNTech) and 55 AZD1222 (AstraZeneca) vaccinees without previous infection or immunosuppressive medication were included. Anti-body levels were quantified 3 weeks after dose 1, in case of AZD1222 directly before boostering (11 weeks after dose 1) and 3 weeks after dose 2, with the Roche SARS-CoV-2 S total antibody assay. Results Pre-booster (BNT162b2 80.6 [25.5-167.0] BAU/mL, AZD1222 56.4 [36.4-104.8] BAU/mL, not significant) and post-booster levels (BNT162b2 2,092.0 [1,216.3-4,431.8] BAU/mL, AZD1222 957.0 [684.5-1,684.8] BAU/mL, p<0.0001) correlated well in BNT162b2 ({rho}=0.53) but not in AZD1222 recipients. Moreover, antibody levels after the first dose of BNT162b2 correlated inversely with age ({rho}=-0.33, P=0.013), whereas a positive correlation with age was observed after the second dose in AZD1222 recipients ({rho}=0.26, P=0.030). Conclusions In conclusion, our data suggest that antibody levels quantified by the Roche Elecsys SARS-CoV-2 S assay before the booster shot could infer post-booster responses to BNT162b2, but not to AZ1222. In addition, we found a vaccine-dependent effect on antibody responses, suggesting a possible link between vaccine response and vector immunity.

Full text: Available Collection: Preprints Database: medRxiv Language: English Year: 2021 Document Type: Preprint

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Full text: Available Collection: Preprints Database: medRxiv Language: English Year: 2021 Document Type: Preprint