Crowne Plaza Changi Airport will be closed for two weeks from today after a second unlinked Covid-19 case - a Malaysian working at the hotel's Azur restaurant - emerged.

The Ministry of Health (MOH) yesterday said it is closing the hotel until Jan 21 as a precautionary measure, as it cannot rule out the possibility that transmissions could have occurred at the hotel.

The hotel will stop accepting new guests, and foreign air crew and guests currently staying at the hotel will be checked out progressively, said MOH.

Incoming air crew will be housed in alternative facilities, it added.

Restaurant and event spaces within the hotel will also be closed, and deep cleaning and disinfection carried out. MOH has also started to test all staff working at the hotel for Covid-19.

The second case at Azur is a 43-year-old Malaysian woman who delivers pre-packed meals to air crew and hotel guests. She was one of two unlinked community cases reported yesterday.

The work permit holder is the second Azur employee to test positive for the infection after a Korean national was confirmed as a Covid-19 patient on Wednesday. Like the Korean, she does not interact with diners at the restaurant.

MOH said she developed symptoms while at work on Sunday and went on Tuesday to a general practitioner clinic, where she was tested. Her result came back positive for Covid-19 infection the next day, and she was taken to the National Centre for Infectious Diseases in an ambulance.

Her serological test result has come back negative, indicating this is likely a current infection.

Preliminary investigations reveal that she is probably not infected with the more infectious British strain of Covid-19, said MOH.

The second community case is a 63-year-old cargo operator at AirMark Aviation who is based at Dnata Cargo Centre.

He mainly handles loading and unloading of cargo for My Indo Airlines, and does not interact with flight passengers.

He developed symptoms on Monday and sought treatment at Changi General Hospital on Wednesday. He was confirmed to be positive for Covid-19 on the same day and warded. His serological test result is pending.

There were also 31 imported cases confirmed yesterday, taking Singapore's total to 58,813. The 31 comprise four Singaporeans, three permanent residents, three dependant's pass holders, two work pass holders and 19 work permit holders.

They tested positive while serving stay-home notice or in isolation after their arrival in Singapore, said MOH.

They came from several countries, including India, Bangladesh and Indonesia. Except for one case, all were placed on stay-home notice upon arrival in Singapore.

The work permit holder arrived from Bangladesh on Dec 22 last year but could not clear immigration due to incomplete documentation. He was held at a facility located at the airport's transit area until Dec 24, and taken to a dedicated stay-home notice facility after the issues were resolved.