Abstract
Background: Post-marketing pharmacovigilance data are scant on the safety of Covid-19 vaccines among people with previous SARS-CoV-2 infection compared with ordinary vaccine recipients. We compared the post-vaccination adverse events of special interests (AESI), accident and emergency room (A&E) visit, and hospitalization between these two groups.
Methods: We conducted a retrospective cohort study using a territory-wide public healthcare database with population-based vaccination records in Hong Kong.
Results: In total, 3922 vaccine recipients with previous SARS-CoV-2 infection and 1,137,583 vaccine recipients without previous SARS-CoV-2 infection were included. No significant association was observed between previous SARS-CoV-2 infection and AESI or hospitalization. Previous SARS-CoV-2 infection was significantly associated with a lower risk of A&E visit (CoronaVac: hazard ratios [HR] = 0.56, 95% confidence intervals [CI]: 0.32-0.99; Comirnaty: HR = 0.62, 95% CI: 0.47-0.82).
Conclusion: No safety signal of Covid-19 vaccination was detected from the comparison between vaccine recipients with previous SARS-CoV-2 infection and those without infection.
Keywords: Covid-19; SARS-CoV-2 infection; vaccine safety.
【저자키워드】 COVID-19, SARS-COV-2 infection, vaccine safety, 【초록키워드】 SARS-CoV-2, Vaccine, vaccination, Hospitalization, SARS-COV-2 infection, Infection, CoronaVac, database, COVID-19 vaccines, COVID-19 vaccination, healthcare, adverse event, Hong Kong, emergency room, association, Accident, retrospective cohort study, two groups, 95% confidence interval, recipients, hazard ratio, lower risk, hazard ratios, recipient, AESI, significantly, conducted, 【제목키워드】 healthcare, adverse event, individual,