For the RT-PCR test:
* true positives (“sensitivity”) are around 70%.
* true negatives (“specificity”) are around 95%.
This info is from BMJ propaganda to low-level quacks (“Practice Pointer”), but still. So prevalence is being over-estimated.
The government recently decided to say it had actually tested 1.3 million fewer people than it “thought” it had. That’s 2% of the population.