"...everyone still PCR positive by day 7 so it was impossible to compare groups" Eh, isn't this what a PCR-test does: detect RNA? A medicine doesn't magically

"...everyone still PCR positive by day 7 so it was impossible to compare groups" Eh, isn't this what a PCR-test does: detect RNA? A medicine doesn't magically remove virus RNA. It might break down the virus or block it's ability to reproduce but the RNA will still be detected.