Immediate Adverse Reaction and SARS-CoV-2 Anti-Spike Receptor Binding Domain IgG of COVID-19 Vaccines Among Health Staffs.

OBJECTIVE: To contain the spread of coronavirus disease 2019 (COVID-19), several vaccines have been developed. This study is intended to elucidate the level of anti-severe acute respiratory syndrome coronavirus 2 immunoglobulin G (anti-SARS-CoV-2-IgG) antibodies for COVID-19 vaccines (Pfizer BioNTech [BNT162b2], Oxford/AstraZeneca [ChAdOx1], and Sinopharm [BBIBP-CorV]) among health staff from health facilities in Duhok province, and it explored the immediate adverse reactions of COVID-19 vaccines among participants.

METHODS: A longitudinal study was conducted from June 1, 2021, to June 30, 2022, and 300 participants were included through simple random sampling.

RESULTS: The immune response 1 mo after the second dose was significantly higher than the sustained immune after 5 and 9 mo as results revealed that, in 100% of study samples who had (ChAdOx1) vaccine, their antibody titers exceeded the positivity threshold of 1 AU/m, while 96% for (BNT162b2) and 90% for (BBIBP-CorV) for the first test after 1 mo from the second dose of the COVID-19 vaccine, and these rates were reduced to 94.6% for (ChAdOx1), 97.8% for (BNT162b2), and 81.9% for (BBIBP-CorV) at 5 mo after the second dose, while simultaneously the seropositivity rates were more reduced at 9 mo to 46.5% for (ChAdOx1), 67.5% for (BNT162b2), and 9.20% for (BBIBP-CorV). In terms of adverse reactionsss, fever was reported as the most prevalent after the first dose in 58% for ChAdOx1, 43% for BNT162b2, and 23% for BBIBP-CorV, followed by muscle pain, joint pain, and shoulder pain for both doses.

CONCLUSIONS: The implications of the findings from this study are that higher and potentially longer antibody responses can be obtained if the BNT162b2 is given as compared with the other 2 vaccines. Moreover, the booster doses of the COVID-19 vaccine are highly recommended because more than 50% of the participants either have become anti-spike protein negative or have a deficient level of anti-spike protein against COVD-19 vaccines.