TAIPEI (Taiwan News) — The Central Epidemic Command Center (CECC) on Monday (Sept. 6) reported a breakthrough infection in a man arriving from Gambia who was inoculated with the Johnson & Johnson COVID-19 vaccine.

A breakthrough infection is defined as a person who has tested positive for COVID-19 at least 14 days after they have completed the full vaccine schedule. At a press conference on Monday, Health Minister and CECC head Chen Shih-chung (陳時中) announced seven imported cases, all of whom were men ranging in age from 20 to 50.

Between Aug. 23 and Sept. 5, they entered the country from Gambia (case No. 16,130), Japan (case No. 16,131), and other countries that have yet to be listed (case Nos. 16,132-16,136). The first case is a Taiwanese man in his 50s who returned from Gambia on Sept. 3.

Philip Lo (羅一鈞), deputy head of the CECC’s medical response division, said that the man was already experiencing a cough when he arrived at an airport in Gambia for his flight on Sept. 1.

He entered an epidemic prevention hotel upon arrival in Taiwan and on Sept. 6 tested positive for COVID-19. Lo said that the man had received the Johnson & Johnson vaccine in early August.

Since his diagnosis came approximately one month after the man received the single-dose vaccine, he has been categorized as a breakthrough infection.