Nine serum samples from SARS-CoV-2-vaccinated participants and one healthy unvaccinated serum sample were collected from our laboratory. The participants were injected with two doses of inactivated SARS-CoV-2 vaccine (Sinovac Biotech, Beijing, China) within 1–2 months. Eleven serum samples from COVID-19 convalescent individuals were collected at Yunnan Provincial Infectious Disease Hospital. All convalescent patients had recovered from COVID-19 for 1–2 months.
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