In 2019, a new coronavirus was identified as the cause of a disease outbreak that originated in China. The disease it causes is called coronavirus disease 2019 (COVID-19). In March 2020, the World Health Organization (WHO) declared the COVID-19 outbreak a pandemic. According to the WHO, since March 1, 2021 there have been 114 million confirmed cases of COVID-19 and a total of 2.5 million deaths worldwide, making it one of the deadliest pandemics in history. Symptoms of COVID-19 vary ranging from none to life-threatening illnesses.