Vaccination against COVID-19 is designed to provide herd immunity. However, there are cases of SARS-CoV-2 infection after vaccination. Using Python software, we calculated the number of SARS-CoV-2 infections per 100,000 adults after the first and second vaccinations as at July 23, 2021, conducted in St. Petersburg, Russian Federation. After the first vaccination with Gam-COVID-Vac (Sputnik V) vaccine, 544 infections were determined, and after the second vaccination - 1,643 cases. After the first vaccination with the EpiVacCorona vaccine, 1,600 infections were calculated, and after the second vaccination - 6,073 cases. After the first vaccination with CoviVac vaccine, 1,162 infections were determined, and after the second vaccination - 886 cases. Cluster analysis revealed the similarity of epidemiological indicators due to Gam-COVID-Vac and CoviVac vaccines, with EpiVacCorona vaccine isolated in a separate cluster, which is associated with significant differences in the calculated epidemiological parameters.

medical epidemiology, medical statistics, the novel coronavirus infection, vaccination, vaccines.

Received: November 3, 2022; Accepted: December 13, 2022; Published: January 5, 2023

How to cite this article: A. B. Kiladze, Clustering of COVID-19 vaccines by SARS-CoV-2 infection level after two vaccinations, JP Journal of Biostatistics 23(1) (2023), 1-10. http://dx.doi.org/10.17654/0973514323001

This Open Access Article is Licensed under Creative Commons Attribution 4.0 International License

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