The impact and effectiveness of new coronavirus vaccine on disease outcome worldwide

Introduction: Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) is spreading rapidly around the world caused serious respiratory disease leading to death, therefore vaccine is the effective way to control this pandemic. Scientists tried to produce safe and effective SARS-CoV-2 vaccines in record time and vaccination program started in December 2020. The aim of this study to determine the impact of SARS-CoV-2 vaccine on COVID-19 disease. Materials and methods: The COVID-19 cases data of post-vaccination and pre-vaccination were collected from Worldmeter website, and the percentage of vaccinated people data obtained from Statistics and Research Coronavirus Vaccinations. The statistical analyses performed with SPSS software version 16.0. Results: The results showed countries with higher percentage of full dose vaccinated people correlated strongly with decrease of death and the severity of the disease among their infected population. This study showed that different vaccine mechanism against SARS-CoV-2 virus of more than 23.5% of vaccination people with full dose vaccine is effective to decrease death and serious symptoms of COVID-19 disease and increasing the recovery rate. Conclusions: Different mechanism type of full dose vaccine against SARS-CoV-2 is effective to decrease death and serious symptoms of COVID-19 disease with increasing recovery rate. It was difficult to assess the effect of single dose alone, therefore more studies are recommended to assess the effect of single dose vaccine with COVID-19 disease outcome and to determine if the vaccine will accelerate the period of recovery rate and reduce the infectious period time in each country.