<Update as of 7 May 2021: The TraceTogether team has updated this article to better explain MOH's tiered approach in advising users based on their risk of infection. Thank you all who gave us feedback! Businesses should not use the Possible exposure information of persons using the TraceTogether App to grant or deny access to premises. More details here.>
MOH takes a tiered approach when it comes to advising users who could have interacted with a COVID-19 case:
- If the risk of infection is assessed to be low: Users are informed via the Possible exposure feature, for self-monitoring.
- If the risk of infection is assessed to be high (e.g. you're a Close contact based on TraceTogether's Bluetooth proximity records): MOH will call you to understand the nature of the contact and advise on the relevant measures you should take.
TL;DR: Possible exposure does not mean you're a Close contact of a COVID-19 case. If you had Close contact with a COVID-19 case, you would have received a call from MOH. We'll continually review the above process of informing users as the COVID-19 situation evolves :)
About Possible exposures
A Possible exposure happens when a user's SafeEntry check-in/-out records from the past 14 days overlaps with a COVID-19 case's visit to a place. The diagram below explains how the overlap is being calculated.
The matching is done at postal code level, so the likelihood of close contact is very small. MOH's advice for users who see Possible exposure records is to monitor their health for 14 days from their date of visit, and see a doctor promptly if they develop symptoms of acute respiratory infection. Depending on the type of venue visited and the current COVID-19 situation in Singapore, MOH may send SMS alerts and/or advise users to take a swab test.