Hani Susianti - Department of Clinical Pathology, Faculty of Medicine, Universitas Brawijaya, Saiful Anwar General Hospital, Malang, East Java, Indonesia
Elvira Sari Dewi - Departement of Nursery, Faculty of Medicine, Universitas Brawijaya, Indonesia
Mufidah Afiyanti - Departement of Biology, Mathematics and Nature Science Faculty, Universitas Brawijaya, Indonesia
Carla Pramudita Susanto - Department of Clinical Pathology, Faculty of Medicine, Universitas Brawijaya, Saiful Anwar General Hospital, Malang, East Java, Indonesia
Sherly Ramawati - Department of Clinical Pathology, Faculty of Medicine, Universitas Brawijaya, Saiful Anwar General Hospital, Malang, East Java, Indonesia
Andrea Aprilia - Doctoral Program in Medical Science, Universitas Brawijaya, Malang, Indonesia
Kusworini Handono - Department of Clinical Pathology, Faculty of Medicine, Universitas Brawijaya, Saiful Anwar General Hospital, Malang, East Java, Indonesia

Background: COVID-۱۹ pandemic has high incidence and mortality, including in Indonesia. One of the prevention efforts is the provision of vaccines, but the ageing of the immune system (immunosenescence) may reduce the immune response to vaccination. Studies reported the decline of interferon-gamma (IFN-γ) could be one of markers of immune cell ageing. Besides, the increases soluble CD۲۸ (sCD۲۸) reported has good correlation with membrane CD۲۸ (mCD۲۸), thus it could be used as an alternative marker for immunosenescence.Objective: To determine the differences in levels of sCD۲۸, IFN-γ and anti-S-RBD antibodies in the group suspected of having an ageing immune system with the control group after vaccination.Methods: Sample consisted of ۲۴ control (healthy adult) and ۳۲ case (elderly and adult with comorbid) subjects. Blood samples were examined for anti-S-RBD antibody, IFN-γ, and sCD۲۸ levels. Analysis of data performed by Median test and Spearman tests.Results: Mean level of anti-S-RBD antibodies, IFN-γ, and sCD۲۸ in case group compared to control group was ۳۳.۰ ±۱۷.۴۷ BAU/mL vs. ۴۵.۹۷ ± ۲۳.۱۳ BAU/mL (p = ۰.۰۰۷); ۴۱.۶۱ ± ۳۸.۷۹ ng/mL vs. ۹۸.۵۹ ± ۹۴.۳۱ ng/mL (p = ۰.۰۰۷); and ۳.۸۰ ± ۳.۶۸ ng/mL vs. ۷.۸۱ ± ۷.۹۷ ng/mL (p = ۰.۲۸۰), respectively. The anti-S-RBD antibodies and IFN-γ levels are lower in case group and sCD۲۸ is lower in case group although not statistically significant.Conclusion: Anti-S-RBD antibodies after COVID-۱۹ vaccination are lower in elderly or comorbid people than in adults without comorbid because of ageing of immune system.

anti, S, RBD antibodies IFN, γ Post COVID, ۱۹ sCD۲۸ Vaccination