Evolution of Acquired Humoral Immunity after Full Vaccination against SARS-CoV-2. IgG Levels in Healthcare Workers at 6 and 9 Months — Oak Academic Publishing
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Evolution of Acquired Humoral Immunity after Full Vaccination against SARS-CoV-2. IgG Levels in Healthcare Workers at 6 and 9 Months
Nursing Faculty Castilla-La Mancha University, Nursing & Society Research Group, Albacete, Spain
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Emergency Department, General Hospital, Almansa, Spain
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Emergency Department, General Hospital, Albacete, Spain
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Nursing Faculty, Nursing & Society Research Group, Universidad de Castilla-La Mancha, Albacete, Spain
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Nursing Faculty, Nursing & Society Research Group, Universidad de Castilla-La Mancha, Albacete, Spain
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Emergency Department, Son Espasses Universitary Hospital, Palma de Mallorca, Spain
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Nursing Faculty, Nursing & Society Research Group, Universidad de Castilla-La Mancha, Albacete, Spain
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Departament of Clinical Microbiology in Albacete General Hospital, Albacete, Spain
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Departament of Clinical Microbiology in Albacete General Hospital, Albacete, Spain
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Emergency Department, General Hospital, Almansa, Spain
1 Nursing Faculty Castilla-La Mancha University, Nursing & Society Research Group, Albacete, Spain
2 Emergency Department, General Hospital, Almansa, Spain
3 Emergency Department, General Hospital, Albacete, Spain
4 Nursing Faculty, Nursing & Society Research Group, Universidad de Castilla-La Mancha, Albacete, Spain
5 Nursing Faculty, Nursing & Society Research Group, Universidad de Castilla-La Mancha, Albacete, Spain
6 Emergency Department, Son Espasses Universitary Hospital, Palma de Mallorca, Spain
7 Nursing Faculty, Nursing & Society Research Group, Universidad de Castilla-La Mancha, Albacete, Spain
8 Departament of Clinical Microbiology in Albacete General Hospital, Albacete, Spain
9 Departament of Clinical Microbiology in Albacete General Hospital, Albacete, Spain
10 Emergency Department, General Hospital, Almansa, Spain
Background: The COVID-19 pandemic continues to be a major worldwide health problem. The present study aims to contribute to surveillance of the immune and clinical response of vaccines to SARS-CoV-2. Methods: Observational medication study on acquired immunity and effectiveness of vaccines. Population: 620 workers in the health service of Almansa (Spain). Representative sample of 150 individuals. Sociodemographic, clinical, and epidemiological data and samples were recorded to determine anti-SARS-CoV-2 serum IgG levels 6 and 9 months after vaccination with Pfizer. Results: Mean age 46.45 years; 76% women; 85.1% working in a hospital. 19.3% had had COVID-19 in the year prior to vaccination. 96.7% were fully vaccinated with Pfizer/BioNTech. At 6 months, 100% seropositivity and mean IgG levels of 3017.2 AU/ml. Significant variations in IgG levels in individuals with prior COVID-19 infection and smokers. At 9 months, 99.3% remained seropositive; 2.8% infected after vaccination. The repeated measures analysis showed a difference in means of 669.0 AU/ml (significant decrease in IgG levels of 28.9%). Conclusion: Antibody levels remained positive 6 and 9 months after vaccination, although IgG levels were found to decay.
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