A suspected case of Covid-19 on a Singapore "cruise to nowhere" has been thrown into confusion after a subsequent test on the patient proved negative.

Royal Caribbean International’s 169,000-dwt Quantum of the Seas (built 2014) was forced to cut short a four-day cruise due to the incident.

However, late on Wednesday, Singapore’s ministry of health (MOH) said that two subsequent tests of the patient had produced negative results.