Macao bars non-residents from entering the city, while residents returning from outside of China have to quarantine for at least 21 days, similar to Hong Kong.
Health officials on Wednesday identified three imported asymptomatic cases in Macao, related to travellers from the United Kingdom and the Philippines.
The former Portuguese colony turned Chinese gambling hub has only recorded 79 confirmed coronavirus cases – using the mainland’s tallying method that excludes asymptomatic patients – and no deaths.
In August, Macao ordered compulsory coronavirus testing for all 680,000 residents after a family of four was found to be carrying the Delta variant, breaking the city’s 16-month streak of being virus-free.
Macao has also adopted mainland China’s health app, which rates infection risk, tracks movement and generates test and vaccination records.