Incidence and Factors Related to Adverse Event Following Immunization of COVID-19 Vaccine: 1-year Observational Study

Authors

  • Pawichwadee Molee Pharmacy Department, Surat Thani Hospital
  • Jantima Yothapitak Pharmacy Department, Surat Thani Hospital

Keywords:

Covid-19 vaccine, AEFI, adverse event following immunization

Abstract

Background: The Coronavirus disease 2019 vaccine (COVID-19 vaccine) is urgently developed to reduce severity of the disease. Thus, incidence of adverse events should be undertaken.

Objectives: The purposes of this study were to collect adverse events and analyze factors associated with the occurrence of adverse events following the COVID-19 vaccination.

Methods: This was an observational study. All adverse events following immunization were collected from the reporting system of the Ministry of Public Health, and the spontaneous report of Suratthani hospital of which vaccination to people during April 10, 2021 to April 30, 2022. General data were analyzed by descriptive statistics. Chi-square or Fisher’s exact test was used to analyze the differences of adverse events following immunization (AEFI) from various vaccine. The association between patient-specific factors and AEFI was analysed by multiple logistic regression.

Results: During the study period, there were 113,570 people vaccinated with 211,922 doses of COVID-19 vaccine. A total of 15,644 AEFI was reported. Of these, 15,634 reports were non-serious and only 10 reports were serious. The highest frequency of AEFI reports was from the Covid-19 Vaccine AstraZeneca® which accounted 6,399 reports. Serious adverse events were anaphylaxis 3 reports, myocardial infarction 3 reports, acute pericarditis 2 reports, myopericarditis 1 report and encephalopathy 1 report. Factors associated with the incidence of adverse events were age, gender, type of vaccine, and underlying disease. Data analysis showed that vaccine recipients in the age group greater than or equal to 60 years increased the likelihood of cardiovascular symptoms, the age group under 18 years and 18-29 years increased the likelihood of neurological symptoms. Females had a greater variety of symptoms than males. Adverse events are often related to the underlying diseases. Recipients In the serious cases usually had underlying disease.

Conclusions: AEFI was mostly observed from Covid-19 Vaccine AstraZeneca® and most of them were non-serious events. Age, gender, vaccine type and underlying disease were associated with AEFI.

Author Biographies

Pawichwadee Molee, Pharmacy Department, Surat Thani Hospital

Pharm.D. (Pharmaceutical Care)

Jantima Yothapitak, Pharmacy Department, Surat Thani Hospital

B.Pharm., M.Pharm (Clinical Pharmacy), BCP.

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Published

2023-04-29

How to Cite

1.
Molee P, Yothapitak J. Incidence and Factors Related to Adverse Event Following Immunization of COVID-19 Vaccine: 1-year Observational Study. Thai J Hosp Pharm [internet]. 2023 Apr. 29 [cited 2026 Jan. 7];33(1):19-38. available from: https://he02.tci-thaijo.org/index.php/TJHP/article/view/260551

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Original Article