My thoughts on the whole group of human herpes viruses are that they appear to be commonly reactivated by this disease, though not always the same virus. Essentially every human herpes virus from HHV-1 (HSV-1) to HHV-8 is involved. Many of these are practically endemic in humans, but commonly remain latent for most of a lifetime. This points to an acquired defect in the mechanisms which hold viral infections latent. Most people who are seriously ill with this disease have multiple active (but not acute) viral infections. Many of these are HHVs, like EBV, CMV, VZV, but not all. Parvoviruses, adenoassociated viruses and bocaviruses are examples of other DNA viruses you may see. Enteroviruses are examples of RNA viruses which sometimes cause these symptoms. If all these are not separate and unrelated diseases there appears to be a fundamental acquired immune defect which (usually) remains limited, unlike AIDS. Limited immunosuppression is the clue which makes me consider retroviruses seriously.
I feel the need at this point for a disclaimer, I do not believe the course of the infection is the same in all people. I am now convinced that over 90% of those infected generally remain asymptomatic, except in cases where some other insult damages immune response. In those exceptions, there is always some confounding factor which can be blamed. Our political problem is that 90+% of the population is not especially vulnerable, most of the time. What happens when they grow old is another matter entirely. The similarity between our symptoms and those of aging people convinces me many more people are affected at some stage in life. Connect the dots, and political will should follow.