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Title: Assessment of humoral immune response to two mRNA SARS-CoV-2 vaccines (Moderna and Pfizer) in healthcare workers fully vaccinated with and without a history of previous infection
Authors: Serrano Barcos, Laura ORCID
Algarate Cajo, Sonia ORCID SCOPUSID
Herrero Cortina, Beatriz ORCID SCOPUSID
Bueno, Jessica ORCID
Gonzalez-Barriga, Maria T.
Ducons, Maria
Montero-Marco, Jesica
Acha, Beatriz
Blanco Taboada, Ana Laura ORCID
Sanz-Burillo, Pilar
Yuste, Cristina ORCID
Keywords: Anti-S IgG SARS-CoV- 2; Healthcare workers; Immune response; Moderna; mRNA SARS-CoV- 2 vaccines; Pfizer; Post-vaccination; RIPOVAC
Issue Date: Sep-2022
Publisher: WILEY
Citation: Laura Serrano and others, Assessment of humoral immune response to two mRNA SARS‐CoV‐2 vaccines (Moderna and Pfizer) in healthcare workers fully vaccinated with and without a history of previous infection, Journal of Applied Microbiology, Volume 133, Issue 3, 1 September 2022, Pages 1969–1974,
Abstract: Aims: Presence of anti-S1region of SARS-CoV-2 spike protein was analysed, at two and eight months, in 477 immunocompetent healthcare workers in Zaragoza, Spain, vaccinated with mRNA-1273 (Moderna) or BNT162b2 (Pfizer). Methods and results: Antibody analysis was performed with Alinity i System (Abbott). At 2 months, 100% of vaccinated had anti-S1 IgG (mean = 13,285 AU ml−1). This value was significantly higher with Moderna (18,192 AU ml−1) than with Pfizer (10,441 AU ml−1). The mean value of anti-S1 IgG after vaccination was significantly higher in patients with than without previous infection (18,539 vs. 7919 AU ml−1); in both groups was significantly higher with Moderna than with Pfizer (21,881 vs. 15,733 AU ml−1 and 11,949 vs. 6387 AU ml−1), respectively. At 8 months, 100% of patients were IgG positive, with higher levels with Moderna than with Pfizer. Nevertheless, in ensemble of cases, a mean decrease of antibody levels of 11,025 AU ml−1 was observed. Conclusion: At 2 and 8 months after vaccination, IgG response persists with both vaccines but with important decrease which suggests the need for revaccination. Significance and impact of study: The study contributes to know the immune status after vaccination with two of more used anti-SARS-CoV-2 vaccines. This knowledge is important for establishing the best vaccination strategy
ISSN: 1365-2672
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