But 13 of the patients have been discharged. The remaining eight patients are still in hospital and their conditions remain stable, said the Ministry of Health in the latest update on Thursday night.

The 19th case is a 21-year-old female Singapore Permanent Resident who is studying in Melbourne.

She returned to Singapore from Melbourne on Singapore Airlines SQ238 on Tuesday at 14.15 pm. She was seated at row 46.

She developed symptoms while on the plane, but was not picked up by the thermal scanner as she did not have fever then. She went home from the airport by taxi and stayed at home for the rest of the day.

On Wednesday, she was sent to the Communicable Diseases Centre (CDC) for assessment via 993 ambulance. Laboratory results confirmed her infection shortly after midnight on Thursday.

The 20th case is a 17-year-old Singaporean youth. He returned to Singapore from Los Angeles via Hong Kong on Cathay Pacific Airways CX717 on June 7 at 12.30 pm. He was seated at row 38.

He was fetched by a family member from the airport. Since his return, he had stayed largely at home. On Wednesday morning, he developed symptoms, and a 993 ambulance was called to send him to CDC for assessment. Laboratory results confirmed his infection on Thursday.

The 21st case is a 21-year-old Indonesian man studying in Australia. He came to Singapore from Melbourne on Singapore Airlines SQ228 on June 9 at 10 pm. He was seated at row 47.

On Tuesday morning, he developed symptoms and sought medical attention at a GP clinic. He then returned to his home did not go out. On Thursday morning, a 993 ambulance was called to send him to CDC for assessment. Laboratory results confirmed his infection on Thursday afternoon.

MOH said contact tracing has been initiated for the three new confirmed cases.

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