Wellington NZ is in alert level 2 again:
On Wednesday it was revealed that a weekend visitor to Wellington from Sydney, who had presumably taken advantage of the ‘bubble’ that has been created between New Zealand and Australia, ‘tested positive’ when he returned home.
We are told that the Ministry of Health has identified more than a dozen locations of interest, mostly eateries and tourist locations, as being visited by the Covid-positive Australian man and his partner. Apparently up to 2500 people visited Te Papa around the time he attended. Those who used the bathroom at 4 Kings Bar at 8.45pm on Saturday are being asked to quarantine for 14 days and get tested immediately.
Now according to the Ministry of Health’s own website, the pcr test, which was presumably the one used, cannot show whether a person is infectious:
What the test results can and cannot tell us
Even when we take the uncertainties of testing into account, the results can tell us a few things.
A positive test tells us that a person either has COVID-19 (whether they have symptoms, or not) or has had COVID-19 recently. We may not be able to distinguish whether the person is currently infectious or not so we will take a precautionary approach.
A positive test cannot tell us:
- if the person is currently infectious
- how ill the person is likely to become.
The inventor of the pcr test, Kary Mullis, always insisted that it should not be used for diagnostic purposes.