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Effective vaccines are essential for controlling the coronavirus disease 2019 (COVID‐19) pandemic. CoronaVac, which is an inactivated virus vaccine, was the first imported COVID‐19 vaccine in Thailand. To investigate the safety and immunogenicity of CoronaVac within the Thai population, we conducted a prospective cohort study among health care workers aged 18–59 years, who received a 2‐dose regimen...