An ideal biomarker would distinguish between individuals who feel severely ill but will not progress to hospitalization and those who might progress, and should be easily sampleable in blood.

“the ideal person to be sampled is that person who comes in like your friend who had trouble running who didn't feel well and I don't think he progressed to having disease enough to get him in the hospital nope yeah young healthy guy in his maybe early 40s and yet never hospitalized but sick as a dog for two weeks right so that's a person you'd like to do a test on and say okay is he gonna progress or not clearly in this case we'd want something to say he's sick but he's not gonna progress because he didn't progress”