The problem with calling a new disease where every test has shown it to be the same is you waste an awful lot of time trying the same thing and getting the same results. That is one way to blow a billion dollars, repeat all the research of the prior 40 years and do it 4 years instead. Science does have a replication issue so its good to do but I wouldn't call it urgent. The urgent need is to study ME/CFS as it develops from Covid infections, you need to track a large number of people and track a wide variety of things in the body and those that develop ME/CFS you get a glimpse as the process taking place. That was the entire point of the NIH programme, its the first moment its viable to study this and the window is closing. Can't help think the systemic prejudice around ME/CFS is the reason so much money and research has been wasted so far.