“…Symptoms are protean, often exhibiting considerable variation between outbreaks. Reports have appeared under a variety of descriptive labels: benign myalgic encephalomyelitis (Daikos, Garzonis, & Paleologue, 1959;Pool et al, 1961), epidemic neuromyasthenia (Albrecht, Oliver, & Poskanzer, 1964;Poskanzer et al, 1957;Shelokov, Habel, Verder, & Welsh, 1957), Iceland disease (Deisher, 1957;White & Burtch, 1954) and (Gilliam, 1938;Sigurdsson, Sigurjonsson, Sigurdsson, Thorkelsson, & Gudmundsson, 1950). While several researchers have argued that the symptoms are elicited by an unidentified virus (Acheson, 1959;Briggs & Levine, 1994;Chester & Levine, 1994), no causative agent has been conclusively identified.…”