On September 4, the Central Epidemic Command Center announced one new confirmed imported case of coronavirus disease 2019 (COVID-19) in Taiwan. The new case is an over 40-year-old female (Case #490). The case visited Japan for work by herself in September of 2019. She returned to Taiwan on September 1, 2020.

The CECC reported that the case had experienced a runny nose on August 25 during her stay in Japan. The case's symptoms improved after she sought medical care at a local clinic. The case was asymptomatic when she arrived in Taiwan. She voluntarily reported her previous symptoms to airport quarantine officers upon entry into Taiwan. After quarantine officers arranged her COVID-19 testing, the case was taken to a group quarantine facility. Infection with COVID-19 was laboratory-confirmed in the case on September 4. The case is currently hospitalized in isolation for medical treatment.

The CECC reported that a cumulative total of 88,031 cases related to COVID-19 have been reported in Taiwan among which COVID-19 has been ruled out in 86,972. Of these reported cases, infection with COVID-19 was laboratory-confirmed in 490 cases. Of 490 confirmed cases in Taiwan, 398 are imported; 55 are indigenous; 36 are naval crew members aboard the Panshi fast combat support ship, and 1 case has unknown sources of infection.