1.Monitoring adverse events of Sinovac COVID-19 Vaccine (CoronaVacTM) in a tertiary government hospital in Pangasinan.
Racquel S. ZARATAN-SAMOLE ; Kate Leslie Ann NAVARRO-AYATI ; Ainstein Marie VILLANUEVA-MISA
Philippine Journal of Internal Medicine 2024;62(3):123-130
BACKGROUND
COVID-19 pandemic led to a dramatic loss of human life worldwide and presented an unprecedented challenge to public health. One of the solutions in addressing the problem was mass vaccination in order to attain herd immunity. However, most people were hesitant to be vaccinated particularly due to their fear of the adverse events; hence the goal of this study was to determine the possible adverse events (AEs) experienced during administration of CoronaVacTM COVID-19 Vaccine.
METHODSThe objective of the study was to monitorthe occurrence of adverse events within one hour, two to 24 hours, and 25 to 72 hours after administration of the first and second dose of CoronaVacTM COVID-19 Vaccine in a tertiary government hospital in Pangasinan.
METHODOLOGYThis cross-sectional study was done from February to April 2021 at Region 1 Medical Center. Employees who received the two doses of Sinovac-CoronaVacTM vaccine and gave their informed consent were included in the study. Participants were monitored closely for adverse events within 30 minutes following administration of the vaccine and were instructed to report any local and systemic AEs to the Hospital Epidemiology Center Office. Individuals were also followed up through telephone to investigate the occurrence of any complaints after 24 to 72 hours.
RESULTSA total of 353 participants who received the complete doses of CoronaVacTM were included in the study. The incidence of AEs was higher after the first dose compared with the second dose. After the first dose of CoronaVacTM 12.5% reported AEs after the 1st hour, 14.2% two to 24 hours after the vaccine, and 1.4% on the 25th hour up to the 72nd hour. Pain on injection site was the most common adverse event during the first hour (8.2%). On the 2nd hour up to 24 hours, headache, and myalgia (14.2%) were more evident. Headache was reported in 1.1% of the participants after 25-72 hours of vaccination. After the second dose, only one participant reported multiple AEs such as fatigue, headache, rash and retroorbital pain (1, 0.7%).
CONCLUSIONIn this study, 28.1% of the participants experienced adverse events afterthe first dose of CoronaVacTM vaccine. AEs were higher after the first dose (28.1%) compared with the second dose (0.3%). Injection site pain was the most common adverse event during the first hour, then headache and myalgia during the 2nd hour up to 24 hours, and headache on the 25th – 72nd hour after vaccination. Only one participant reported several AEs after the 2nd dose of the vaccine.
Covid-19