  This study aims to statistically assess the effectiveness of vaccination
against SARS-CoV-2. It is indispensable to investigate the relationship between
Covid-19 deadliness and vaccination in order to study the impact of vaccine in
real-world. We studied rates of infection and death due to Covid-19 in
different countries with respect to their levels of vaccination. People who
received the required dose of vaccination were considered as fully vaccinated
in this study. Based on the percentage of fully vaccinated population,
countries were categorized into several groups. Though a high-level study on
the vaccine effectiveness may not provide much insight for individual level
differences, a global analysis is imperative to infer the influence of
vaccination as a controlling measure of the pandemic.
