The samples - one from each nostril - will be couriered to the Home Team Science and Technology Agency (HTX) laboratory at Pasir Panjang Scanning Station as soon as they have been collected.

The lab, which will be staffed round the clock by a team of about 20 scientists, will test the sample. It can test up to 200 samples a day.

On Thursday, the Ministry of Home Affairs gave reporters a look at how new precautionary testing measures, which have been deployed at all checkpoints, will be implemented. They will apply to those entering Singapore, but not those who are transiting here.

When they arrive, travelers go through a temperature screening area, which is manned by healthcare assistants. Such screening areas have been progressively set up since January.

Those who have a fever or other symptoms of respiratory illness will be referred to a health screening station at the checkpoints, where they will be assessed by nurses or a doctor, and they may be asked about their travel history.

Anyone considered a clinical suspect - suffering from pneumonia or severe respiratory infection with breathlessness who has visited areas severely hit by the virus over the past 14 days before the onset of symptoms - will be referred to a hospital.

Read also: Infected passenger flew on Singapore Airlines from Milan to Singapore

Even those not considered clinical suspect cases may be asked to undergo a Covid-19 swab test.

Once the swab test has been completed, the traveler can immediately carry on with his journey but is advised to minimize contact with others. He will be required to leave his contact details and will be informed of his test results. Those with positive results will be sent to hospital in an ambulance.

A Ministry of Health spokesman said that if someone leaves Singapore before receiving positive test results, MOH will obtain information on where he has traveled to.

"As per World Health Organization regulations, MOH is obliged to inform relevant counterparts in other countries, who will commence contact tracing according to their jurisdiction."

The Covid-19 test kit deployed at all checkpoints is the result of a collaboration between HTX and Veredus Laboratories, a Singapore-based biotech firm, HTX said.

Development of the test kit started in January and was completed in about three weeks, said Ms May Ong, director of HTX's Chemical, Biological, Radiological, Nuclear and Explosive Center of Expertise. It has an accuracy of more than 99 per cent, and is able to test for a result in three hours.

"This kit has a different technological platform as compared with what is typically used in hospitals. This is meant to be a rapid screening process, as the responsibility of my team is to safeguard the border... so, we will typically use a faster method," said Ms Ong.

Other Covid-19 tests in hospitals may take six to 10 hours. This is because hospitals test not just for the presence of the virus, but also its severity.

As of noon on Thursday, the HTX lab had conducted one test since the new measure kicked in on Wednesday night. It was not able to share details of the test results.

A new ban on the entry or transit in Singapore of travelers who have been to northern Italy, South Korea and Iran also kicked in at 11:59 p.m. on Wednesday. As of 3 p.m. on Thursday, entry had been refused to one traveler with recent travel history to South Korea and two travelers with recent travel history to northern Italy.

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