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Home > Archives > Volume 20, No 11 (2022) > Article

DOI: 10.14704/nq.2022.20.11.NQ66180

IL-15 and SARS-CoV-2 S1-RBD IgG serum levels decrease after 4 months of the 2nd dose of Pfizer–BioNTech vaccine administration which was given to the medical college students at Diyala University

AbeerAiedAbdulameer, Ahmed Rushdi Abdullah, Ismail Ibrahim Latif


Background: Fighting the Covid-19 pandemic is one of the global priorities now, and the most important type of pandemic control is vaccination. Pfizer-Biotech is considered one of the most important vaccines currently because of its high effectiveness in stimulating the immune system, despite limited data regarding the duration of the response and its side effects. The goal of this study is to assess the response ofSARS CoV-2 S1-RBD IgG andInterleukin-15 after 30 and 120days fromthe 2nd dose ofPfizerBioNTech vaccine which applied on themedical college students at Diyala university. Methodology: This study began after the obtainment of the Medical College of the University of Diyala, the Medical College of Al-IraqiaUniversity, and the Iraqi Ministry of Health approvals . It continued from October 2021 until March 2022.A total of45 male and femaleparticipants from the College of Medicine( DiyalaUniversity)students who took thetwo doses of Pfizer-BioNTech and were divided into two groups: 1 month (30 days) and 4 months (120 days) after the full vaccination (two doses).A 5 ml of their blood was taken two times (30 days and 120 days after the 2nd dose of thePfizer-BioNTech vaccine) in the postgraduate laboratories inside the Diyala Medical College. A serological analysis to quantify IL-15 and SARS CoV-2 S1-RBD IgG has been done using BT LAB/ Bioassay Technology Laboratory/ Human Interleukin 15 ELISA Kit from CHINA andDiasino/ SARS CoV2 S1-RBD IgG ELISA Kit/ CHINA respectively. All the lab work happened in the postgraduate laboratories inside the Diyala Medical College. Demographic information (Age and Gender) has been collected from the participants. These participants were split into two groups depending on the time after the 2nd of Pfizer-BioNTech vaccine dose (1 month and 4 months, respectively). STATISTICA (version 12 )and SPSS (version 26 ) were used to input, review and data analysis. Essential approaches of percentages and frequencies were used for qualitative variables, while, average and standard deviation were used for quantitative variables. For both IL-15 and SARS CoV-2 S1-RBD IgG, less than 0.05 of a P-value was considered considerable. Results: The ratio, according to gender, was (17.8: 82.2) while the age Average was (20.9 years old). The serum data of IL-15 and SARS-CoV-2 S1-RBD IgG levels after 1 month (30 days) and 4 months (120 days) were statistically non-parametric. Mann-Whitney test (Independent two samples), showeda considerabledrop(P<0.05) of IL-15as well as SARS CoV-2 S1-RBD IgGserum levels in the 4th -monthsgroup compared to the 1-monthgroup. Conclusion: Interleukin-15 and SARS CoV-2 S1-RBD IgG serum levels significantly droped after 120days of the 2nd dose of Pfizer-BioNTech vaccine.


SARS CoV-2 S1-RBD IgG, IL-15, Pfizer-BioNTechvaccine, students of the medical college, Diyala university.

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