Since the first cases of pneumonia of an unknown origin were identified in Wuhan, the capital city of Hubei province, China in December 2019, Chinese scientists have urgently and persistently worked to determine the causative agent. This novel coronavirus was officially termed as 2019-nCoV or SARS-CoV-2 (1-3). Although the pathogen was quickly identified, the characteristics of its transmission were not initially estimated accurately. The highly contagious nature of SARS-CoV-2 further exacerbates the situation, as does the population’s general susceptibility to it. The result of this is frequent human-human transmission among close contacts, including medical workers.