With the increased availability of RATs and the return to school, I found this ABC article helpful in explaining false negatives (sensitivity) and false positives (specificity).
The TGA also recently published a list that suggests that some RATs are not as good at picking up Delta and/or Omicron than others. It leads to confusing situations such as two weeks ago when I was consistently getting a positive result from one brand but getting negative results from another brand and from the PCR. As a precaution I isolated from the rest of my family and the world for a week, and things got pretty lonely in my room though it was nice to have family meals over Zoom.
https://www.tga.gov.au/post-market-review-antigen-and-rapid-antigen-tests
