Some more suggestive evidence that Singapore might not be testing asymptomatic/minimally symptomatic people:
The COVID-19 swab test kit deployed at [travel] checkpoints allows us to test beyond persons who are referred to hospitals, and extend testing to lower-risk symptomatic travellers as an added precautionary measure. This additional testing capability deployed upfront at checkpoints further increases our likelihood of detecting imported cases at the point of entry. As with any test, a negative result does not completely rule out the possibility of infection. As such, symptomatic travellers with a negative test result should continue to minimise social contact and seek medical attention should symptoms not improve over the next three days.
If they were already testing lots of asymptomatic cases, it would be odd to say testing *symptomatic travelers* is allowing them to test beyond people referred to hospitals.”
I wonder if people are assuming that intense contact tracing means that contacts will be tested by default even if asymptomatic. I’m not an expert but my understanding is that this isn’t necessarily the default (and particularly not in a situation where they presumably don’t have an infinite supply of kits or healthcare workers to do the diagnostics). Depends on how close the contact was, the specific disease, etc, but I think default is to call the contact every day to check if they’ve developed symptoms. Would be great if an actual doctor/epidemiologist chimed in.
Singapore’s description of their contact tracing is vague but consistent with my understanding:
Once identified, MOH will closely monitor all close contacts. As a precautionary measure, they will be quarantined for 14 days from their last exposure to the patient. In addition, all other identified contacts who have a low risk of being infected will be under active surveillance, and will be contacted daily to monitor their health status.
14. As of 3 March 2020, 12pm, MOH has identified 3,173 close contacts who have been quarantined. Of these, 336 are currently quarantined, and 2,837 have completed their quarantine.
Yes as part of a team on standby briefed on contact tracing protocol in Singapore I can confirm, we only call and inform potential contacts . They are not tested unless I’ll.
Some more suggestive evidence that Singapore might not be testing asymptomatic/minimally symptomatic people:
https://www.moh.gov.sg/news-highlights/details/additional-precautionary-measures-in-response-to-escalating-global-situation
If they were already testing lots of asymptomatic cases, it would be odd to say testing *symptomatic travelers* is allowing them to test beyond people referred to hospitals.”
I wonder if people are assuming that intense contact tracing means that contacts will be tested by default even if asymptomatic. I’m not an expert but my understanding is that this isn’t necessarily the default (and particularly not in a situation where they presumably don’t have an infinite supply of kits or healthcare workers to do the diagnostics). Depends on how close the contact was, the specific disease, etc, but I think default is to call the contact every day to check if they’ve developed symptoms. Would be great if an actual doctor/epidemiologist chimed in.
Singapore’s description of their contact tracing is vague but consistent with my understanding:
https://www.moh.gov.sg/news-highlights/details/two-new-cases-of-covid-19-infection-confirmed
If they were administering tests to asymptomatic contacts, I think it’s likely they’d have said so here.
Yes as part of a team on standby briefed on contact tracing protocol in Singapore I can confirm, we only call and inform potential contacts . They are not tested unless I’ll.
Thanks for confirming!
How ill do they have to be? If a contact is feeling under the weather in a nonspecific way and has a cough, is that enough for them to get tested?
Do you feel like you have any insight into whether underreporting of mild/minimally symptomatic/asymptomatic cases?