RT Journal A1 PETERSDORF RG, BENNETT IL, Jr. T1 THe experimental approach to the mechanism of fever JF A.M.A. Archives of Internal Medicine JO A.M.A. Archives of Internal Medicine YR 1959 FD June 1 VO 103 IS 6 SP 991 OP 001 DO 10.1001/archinte.1959.00270060143021 UL http://dx.doi.org/10.1001/archinte.1959.00270060143021 AB Fever may be defined as any abnormal elevation in body temperature. Although abnormal elevation of body temperature is sometimes a reflection of normal physiological processes, such as exercise, consumption of food, menstruation, and pregnancy,1 it is properly designated as fever only when it is a manifestation of disease. The investigations of Wunderlich2 first placed clinical thermometry on a firm basis, and his findings formed the nucleus of a large body of empiric knowledge concerning fever as a manifestation of disease. Despite the fact that much is known about fever from the clinical point of view, the mechanisms responsible for this important physiological disturbance are poorly understood. It is the purpose of this report to summarize the results of experimental studies on the pathogenesis of fever.Relationship of Fever to Tissue Injury  Many widely diversified pathological entities are associated with fever. Among these are infections; "collagen-vascular diseases," such as