Hong Kong should begin a trial of gradually reopening its borders with the rest of the world, and slash its quarantine requirements, once the overall vaccination rate nears 90 per cent, the city's virus experts wrote in an opinion piece.

An initial reopening could focus on business travellers whose vaccination records are verified with antibody tests, a team from the University of Hong Kong's (HKU) Li Ka Shing Faculty of Medicine wrote in the Ming Pao newspaper.

They suggested cutting the city's lengthy quarantine period to 48 hours, from what can currently stretch out to as long as three weeks.

The authors, including Professor Yuen Kwok-yung, a top government adviser and world-renowned expert in microbiology and infectious diseases, urged the government to proactively boost vaccination rates and booster shot coverage.

Currently, only 62 per cent of the population is fully vaccinated, according to Bloomberg's vaccine tracker.