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发热可由未知的因素引起,也可以是重病的信号。发热是机体体温调节系统异常所致。细菌或其他微生物所产生的外源性致热源或由微生物、抗原-抗体复合物或其他刺激物激发而释放的内源性致热源均可引起发热,但某些病者的体温升高却无明显原因。
Fever can be caused by unknown factors, but it can also be a sign of serious illness. Fever is caused by abnormal body temperature regulation system. Exogenous pyrogenic sources produced by bacteria or other microorganisms, or endogenous pyrogen sources released by microbes, antigen-antibody complexes, or other stimuli, can cause fever, but in some patients the body temperature increases but none Obvious reason