On September 23, the Central Epidemic Command Center (CECC) announced that Taiwan had received notifications recently from the Philippine and Japanese authorities through the International Health Regulations (IHR) National Focal Point that some travelers had tested positive for coronavirus disease 2019 (COVID-19) after the travelers' departure from Taiwan. The CECC reported that it also received the related notification from some traveler. According to the notifications from those two countries, a total of 18 Philippine nationals and 1 Japanese national have tested positive for COVID-19 after they returned to their home countries from Taiwan.

The CECC reported that the 18 Philippine nationals left Taiwan between August 19 and September 11. They all tested positive upon arrival in the Philippines. A total of 372 individuals have been identified as the contacts of those cases in Taiwan. Of the 372 contacts, 202 have been identified as individuals subjected to COVID-19 testing; the 202 individuals all tested negative after undergoing RT-PCR and antibody tests.

Regarding the Japanese case, the Japanese national is an over-50-year-old male. He entered Taiwan on August 29 and returned to Japan on September 14. The Japanese man took an antigen test upon arrival in Japan, and the test result came back positive. Earlier this month, the man voluntarily notified Taiwan's health authorities that he was given additional RT-PCR tests to confirm his positive test result on September 20 and September 21, and he tested negative. Only one individual has been identified as the contact of the Japanese man in Taiwan, and the individual tested negative after undergoing both RT-PCR and antibody tests.