2021
DOI: 10.2807/1560-7917.es.2021.26.6.2100096
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Impact of age, ethnicity, sex and prior infection status on immunogenicity following a single dose of the BNT162b2 mRNA COVID-19 vaccine: real-world evidence from healthcare workers, Israel, December 2020 to January 2021

Abstract: The BNT162b2 mRNA COVID-19 vaccine showed high efficacy in clinical trials but observational data from populations not included in trials are needed. We describe immunogenicity 21 days post-dose 1 among 514 Israeli healthcare workers by age, ethnicity, sex and prior COVID-19 infection. Immunogenicity was similar by ethnicity and sex but decreased with age. Those with prior infection had antibody titres one magnitude order higher than naïve individuals regardless of the presence of detectable IgG antibodies pre… Show more

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Cited by 277 publications
(296 citation statements)
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“…These results are encouraging for both short-and long-term vaccine efficacy and add to our understanding of SARS-CoV-2 mRNA vaccine-induced immune responses in several ways. First, our serological data are consistent with several other recent studies (20,21,23,24,28,29) indicating robust boosting of antibody responses in SARS-CoV-2 recovered subjects after the first vaccine dose, but little benefit to antibody levels after the second vaccine dose. This finding was also reflected in the observation that neutralizing titers against both D614G and the B.1.351 South African variant reached a peak after the first dose in recovered subjects.…”
Section: Discussionsupporting
confidence: 92%
“…These results are encouraging for both short-and long-term vaccine efficacy and add to our understanding of SARS-CoV-2 mRNA vaccine-induced immune responses in several ways. First, our serological data are consistent with several other recent studies (20,21,23,24,28,29) indicating robust boosting of antibody responses in SARS-CoV-2 recovered subjects after the first vaccine dose, but little benefit to antibody levels after the second vaccine dose. This finding was also reflected in the observation that neutralizing titers against both D614G and the B.1.351 South African variant reached a peak after the first dose in recovered subjects.…”
Section: Discussionsupporting
confidence: 92%
“…Antibody responses after a single vaccine dose were significantly higher in previously infected vaccinees, consistent with similar reports in younger healthcare workers [8]. Two doses of vaccine produced very high spike antibody levels, with significantly higher antibody levels in those with prior SARS-CoV-2 infection.…”
Section: Discussionsupporting
confidence: 85%
“…Interestingly, this type of response is present whether or not individuals developed a symptomatic COVID-19 disease. These observations are in line with the hypothesis that the first vaccine dose serves as a boost in naturally infected individuals [9]. Our study has some limitations.…”
Section: Discussionsupporting
confidence: 86%