Is CFS caused by a virus? Letter to the NY Times

After listening to the life history of numerous chronic fatigue clients, there is little doubt in my mind that their immune / endocrine system has become compromised over time as a result of a number of factors, in particular traumatic life events and, more to the point, how these events were perceived and dealt with (or not), at the time. How one deals with or responds to these events then leads to certain habits, behaviours and stress patterns being set in place.