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Öğe COVID-19 Seroprevalance in a University Hospital Health Workers(Bilimsel Tip Yayinevi, 2021) Arslan, Gokce Kader; Ozdemir, Mehmet; Kaya, Havva; Feyzioglu, Bahadir; Kepenek Kurt, Esma; Erayman, IbrahimIntroduction: Healthcare workers are at the forefront in the Pandemic war against COVID-19 (Coronavirus Disease 2019) caused by SARS-CoV-2 (Severe Acute Respiratory Syndrome Coronavirus-2). In this struggle, they have become high-risk by keeping in close con- tact with patients during their diagnosis, treatment, and follow-up with long working hours. The aim of this study was to contribute to epidemiological data of our country by examining the antibody status of our hospital healthcare workers. Materials and Methods: Anti-SARS-CoV-2 IgG/IgM, COVID-19 ELISA kits were studied from sera samples of healthcare workers in Necmettin Erbakan University Meram Medical Faculty Hospital between June 1 and November 30, 2020. Nasopharyngeal swab sam- ples of these persons were also tested with the Real Time Polymerase Chain Reaction (RT-PCR) method. Results: SARS-CoV-2 seroprevalence of 741 healthcare workers included in our study was found to be 17%. Seropositivity was detected in 6.4% (33/515) of the healthcare workers with negative SARS-CoV-2 PCR test and in 3.9% (5/130) of the healthcare workers who did not have PCR test. Among the healthcare workers, the highest seroprevalence was observed in nurses (39.6%) followed by doctors (%23). Conclusion: It was evaluated that SARS-CoV-2 seroprevalence in healthcare workers is higher than in the population. This study shows that occupational exposure is a risk factor. 3.9% seropositivity was found in healthcare workers who never had a test. Considering that these workers have an asymptomatic or subclinical infection, there is a possible risk for nosocomial transmission. Therefore, healthcare professionals should use personal protective equipment and apply hygiene rules correctly and effectively in infectious diseases, especially during pandemic periods, while working in the hospital.Öğe Memory B cells and serum immunoglobulins are associated with disease severity and mortality in patients with COVID-19(Oxford Univ Press, 2022) Colkesen, Fatih; Kepenek Kurt, Esma; Vatansev, Hulya; Korkmaz, Celalettin; Colkesen, Fatma; Yucel, Fatih; Yildiz, ErayPurpose of the study The aim of this study was to investigate the relationship of B cell-mediated immunity with disease severity and mortality in patients with COVID-19. Study design In this retrospective cohort and single-centre study, 208 patients with laboratory-confirmed COVID-19 were recruited. A COVID-19 severity score, ranging from 0 to 10, was used to evaluate associations between various factors. Serum immunoglobulin levels and the number of cells in B lymphocyte subsets were measured and their association with disease severity and mortality in patients with COVID-19 examined. Results The median age of the patients was 50 (35-63) years and 88 (42%) were female. The number of deceased patients was 17. The median COVID-19 severity score was 8 (6-8) in deceased patients and 1 (0-2) in survivors. Deceased patients had significantly lower levels of total B lymphocytes, naive B cells, switched memory B cells, and serum IgA, IgG, IgG(1) and IgG(2) than recovered patients (all p<0.05). In addition, a significant negative correlation was found between the number of these parameters and COVID-19 severity scores. Decrease in the number of total B cells and switched memory B cells as well as lower serum IgA, IgG and IgG(1) levels were independent risk factors for mortality in patients with COVID-19. Conclusion In the present study, the prognosis of patients with COVID-19 was shown to be associated with the B cell subset and serum immunoglobulin levels.