The issue of contact tracing is moot - the virus is out of the box - and the tests are from many manufacturers and have unreliable high false neg and pos results - the tests are inherently unreliable - along with the reporting system from hospitals due to financial incentives to over-report wuhan virus cases and deaths.
The studies are based on flawed assumptions as to the accuracy of the antigen tests.
Some of the testing is antibody testing - and meaningless for practical purposes.
Originally Posted by oeb11
What does "moot" mean? Invalid?
Most incorrect test results are false negatives, not false positives. For negative tests, no contact tracing occurs. If a test comes back positive, it is almost certain that the person is infected.
Given a large sample of infected people, if more say they visited a bar in the previous 2 weeks than a shopping mall, we can confidently state the risk is higher for bars. In some cases, it's possible to identify "super-spreader" events where dozens of people who test positive say they attended the same event.
It's not rocket science, but it is "science" insofar as we are looking for and measuring data correlations.
Read the links I provided for you.