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Vaccination induces significantly higher serum levels of antiviral antibodies than only natural infection with SARS-CoV-2. Serum levels of specific antibodies in vaccinated and nonvaccinated individuals were compared by Student’s t test. We had a total of 202 vaccinated individuals and 8 nonvaccinated individuals in this study. Statistical significance was set as P ≤ 0.05. The y axis shows absorbance as optical density (OD) values.
