F ever normal body temperature 370. Circadian variation <10 C Definition of fever an elevation of core body temperature above the normal range rectal T0.5> oral T0.5> axillary T(腋温)Fever •Normal body temperature: 37oC, Circadian variation <1o C •Definition of fever: An elevation of core body temperature above the normal range rectal T 0.5oC > oral T 0. 5oC > axillary T（腋温）