This is how they track people possibly exposed to the virus in Singapore, wondering what kind of "tracking" system they might use in China..
Coronavirus: How contact tracers track down the people at risk of infection
by Salma Khalik
Feb 9 2020
''Dr Olivia Oh, assistant director in the Communicable Diseases Division of the Ministry of Health (MOH), said the hospital where the patient is warded would do an activity map - this refers to everything the patient has done and the people he has been with over the previous two weeks.
Her colleague, Mr Pream Raj, also an assistant director in the division, added: "The mapping is detailed, 24 hours, minute by minute, with no gaps."
If there are gaps, then the contact tracing team would call a patient to try and jog his memory. And if the patient is too sick, they would approach his next of kin instead.''
He said although 14 days may seem like a long time ago, most people have routines, so it is not that difficult to recall what they had been doing.
If they had meals with people, and because of Chinese New Year many did, they need to remember who was there. If it was at a restaurant, they need to recall if any of the serving staff spent much time with them, or if the contact was casual.
For the 17 patients from China who were confirmed with the virus here, Dr Oh said they would start the contact tracing from the time they arrived in Singapore, assuming that they had caught the virus while still in China.
They would get the list of passengers sitting in the same row, as well as two rows in front and two rows behind the patient, from the airline, and get in touch with them.
Mr Raj said the airlines, taxi companies and Grab, since quite a number of the visitors use that service, have all been very cooperative - they are obliged to provide all information required under the Infectious Diseases Act.
Sometimes, patients have no taxi receipt, remembering only that they were in a blue cab. The contact tracers would go through the closed circuit television footage at the hotel driveway to identify the taxi.''