COVID-19 is usually characterized by fever, cough, and myalgia or fatigue, and shows a mortality of 3.4% with progressive respiratory failure or multiple organ failure [5]. The median incubation period of COVID-19 is 5.1 days in 50 provinces, regions, and countries outside Wuhan, Hubei province, China [6]. However, several reports described that SARS-CoV-2 may show a longer incubation period (~19 days) and human-to-human transmission in the incubation period, making difficult to prevent the infection from spreading [7]. The transmission mechanism of SARS-CoV-2 has not been fully elucidated, although it shows a highly communicable ability through aerosol droplets [8]. Currently, early detection of SARS-CoV-2 and adequate isolation of patients are the most effective countermeasures to prevent human-to-human transmission of the virus. Therefore, development of an on-site, rapid, and sensitive diagnostic assay for SARS-CoV-2 infections is of top priority to provide an appropriate treatment and establish a surveillance system to prevent the spread of COVID-19.