I’ve always believed Fibro is viral. I was diagnosed in 1982, when it was fibrositis. I was teaching in a primary grade school with an open-concept “team teaching” philosophy. I was in a team with six adults, all interacting daily. Half of us were diagnosed eventually with fibrositis, the first being the new-hire teaching assistant. She was young, healthy, active, and a ballet teacher on the side when she started to lose the use of her legs (a common symptom is legs feeling like dead weights - which I experienced when first being diagnosed). No other folks on the faculty were ever diagnosed with fibro to my knowledge - just half of my six member team. I was in my early thirties, diagnosed about a year after the first young teaching assistant was diagnosed. The third individual was my teaching assistant who was diagnosed a few years later (I think the virus might’ve been dormant in her, activating eventually while she was under stress. I, too, was stressed when diagnosed - going through a separation, working on my graduate degree, and teaching full time).