[hluska]

I’m not OP, just a concerned parent who is trying to figure things out. I have not been able to locate a single scientific study about this. Rather, the evidence all seems to be news reports of people testing positive, then negative and then positive again. Since it isn’t scientific, all the usual caveats apply - we don’t know much about how effective those tests were and again, these are news reports.

If you’re interested, I can post some news reports. Forbes actually has a pretty good rundown of the various news articles, but Forbes isn’t always the best place for facts or safe browsing, so I’ll avoid posting that one. In the interest of fairness, I can also post (much older) news reports that called HIV/AIDS “Gay Related Immuno-deficiency” and we know how good that science was.

[timhigins]

The truth is that these current tests (rt RT-PCR) are not completely accurate and may only have a true positive rate of 60-70%. See Discussion section of: https://pubs.rsna.org/doi/10.1148/radiol.2020200642

Additionally, people who are asymptomatic can test negative on all of their tests and only be diagnosed via other means. See Figure 1 here: https://link.springer.com/content/pdf/10.1007/s11427-020-166...

[projektfu]

You have that a little backwards. The positive predictive value in the discussion is for CT. rtPCR is being used as the definitive test but it lacks sensitivity so it has false negatives. The 59% rate for rtPCR positive suggests that they are missing cases that CT might catch. However, the CT findings are not “pathognomonic” meaning that other conditions can cause the appearance of viral pneumonia (such as influenza).