From the earliest times fever with all its remarkable symptoms has been familiar not only to physicians, but even to the general public, and the term is one so honored by age and by the good that must consequently inhere in it, that it can not be discarded or dismembered. It is, nevertheless, very difficult to define this conception clearly because even yet we are unable to say with certainty at what point the direct effects of the cause of the disease end and what really belong to the fever. For, although the elevation of the body temperature is one of the most salient points, it is by no means the only characteristic nor is it itself always to be regarded as an infallible sign of fever, for such elevation of temperature may occur in a perfectly healthy person, if, for example, he be immersed in a hot
MacCALLUM WG. FEVER. Arch Intern Med (Chic). 1909;II(6):569–602. doi:10.1001/archinte.1909.00050110068005
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