[andai]

>The gold standard to test for viruses lurking in the body is with a gut biopsy, but "it wouldn't be ethical to go around taking out bits of people's guts to have a look," Altmann says. So new ways to test this would need to be worked out.

Isn't this standard procedure for cancer testing? Or is it a more invasive procedure?

If someone's experiencing symptoms as debilitating as the article says, I think they'd be OK with some short term pain in exchange for some forward progress.