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The Coronavirus Disease 2019 ( COVID - 19 ) is caused by a highly transmissible and pathogenic coronavirus, which is known as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that emerged in China in late 2019, and now has five major variants: Alpha , Beta, Gamma, Delta, and Omicron . The COVID - 19 pandemic has lasted for two and a half years since it was declared as a Public Health Emergency of International Concern (PHEIC) on January 30, 2020, and has registered about 576.3 million cases and 6.4 million deaths worldwide as of July 31, 2022. In this article,...
