Covid-19 crisis Risk of tranmission - local vs imported

Average daily swab tests over the past week: 22,500  Source:

Total cases during the past 7 days 22,500, average per day: 3,217  
Source.

Case positivity rate (community): 3,217 / 22,500 = 14.3%

As at 8 Oct 2021, more than 3,100 travelers have entered Singapore on the VTL lanes. Only 2 were tested positive on arrival. Source.

Case positivity rate (travelers) = 2/3100 = 0.06%.

The risk of transmission within the community is 238 times higher than the imported cases (14.3/0.06). 

One possible reason for this big difference is that the travelers are likely to be pre-tested as "safe for travel", so the chance of being found positive is low.

Tan Kin Lian

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may be these VTL travellers will get covid few days later in S'pore or upon aariving at home since this disease take sometime to develop.

zhang  08 Nov 2021  

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