Singapore confirmed 54 new Covid-19 cases yesterday, with the overwhelming majority of the cases once again coming from overseas.

A total of 48 of the 54 are imported cases, and all except one of the imported cases are returning residents and long-term pass holders.

The number set a new record for the number of cases announced in a day and came as the Government announced that all travellers arriving in Singapore - including Singapore citizens, permanent residents and long-term pass holders - must submit an online health declaration before proceeding with immigration clearance.

Singapore on Sunday also announced that it will take the unprecedented step of barring all short-term visitors, including tourists.

The latest imported cases had travelled to Europe, North America and South-east Asia. Thirty-four of the imported cases had been to Britain.

The remaining six cases announced yesterday are currently not linked to travel or previous cases. Contact tracing is ongoing.

About 57 per cent of all cases announced yesterday are under 30 years old.

This brings the total number of infected patients here to 509, of which 15 are in critical condition in the intensive care unit. Eight more cases have been discharged, meaning 152 have fully recovered.

To date, the Ministry of Health has identified 8,351 close contacts who have been quarantined. Of these, 2,529 are now quarantined, and 5,822 have completed it.

To cope with the coronavirus outbreak, Deputy Prime Minister Heng Swee Keat will be presenting a supplementary budget in Parliament on Thursday and will detail additional support measures to help workers, businesses and households.

The coronavirus has infected more than 343,000 people worldwide and killed more than 14,900.