SEOUL (Reuters) - South Korea is testing a new quick response (QR) code system this week to log visitors at high-risk entertainment facilities, restaurants and churches in a bid to track coronavirus cases and prevent further spread of the disease.

The decision to mandate QR codes to register visitors' identities came after authorities struggled to trace people who had visited a number of nightclubs and bars at the centre of a virus outbreak last month after much of the information on handwritten visitor logs was found to be false or incomplete.