an infectious disease caused by SARS-CoV-2. The outbreak of disease started in Dec. 2019 with the first case reported in China. The World Health Organization (WHO) recognised the outbreak of COVID-19 as a pandemic on 11 March 2020.
By the end of July 2020, there are over 17 million confirmed cases and close to 700 thousand deaths which have brought the economies of many countries to a halt. And there is still risk of the next waves of COVID-19 pandemic.