[jfasi]

This is the relevant response. What the commenter is trying to imply is that the authors of this study are so staggeringly stupid that they overlooked the possibility of false positives when designing this experiment.

In reality, this test would need a false positive rate of over eighty percent to explain this kind of asymptomatic infection rate.

Also, prisons are useful because due to the close quarters it can be taken as a given that a substantial proportion of the population is infected, further minimizing the danger of these sorts of errors. The choice of population suggests a sophisticated experiment design, and the commenter is implying that the study authors made a statistics 101-level error.

[MrPatan]

As someone else has said on another comment, it just needs the experimenter to be infected and a bit careless, and there is your high percentage of positive results.

Plus yeah, to be honest, you dismiss staggering stupidity leading to juicy headlines at your own risk.