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Abstract

Sera were collected from 185 adults aged ≥ 70 years in London to evaluate the immune response to COVID-19 vaccines. A single dose of Pfizer/BioNtech vaccine resulted in > 94% seropositivity after 3 weeks in naïve individuals using the Roche Spike antibody assay, while two doses produced very high spike antibody levels, significantly higher than convalescent sera from mild-to-moderate PCR-confirmed adult cases. Our findings support the United Kingdom’s approach of prioritising the first dose and delaying the second dose of COVID-19 vaccine.

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/content/10.2807/1560-7917.ES.2021.26.12.2100329
2021-03-25
2024-11-01
http://instance.metastore.ingenta.com/content/10.2807/1560-7917.ES.2021.26.12.2100329
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