To summarize XU Jingshi's clinical experience in treating fever from the perspective of latent pathogen. It is believed that latent pathogen heat accumulation is an important pathogenesis of fever. For latent pathogen in

shaoyang

and membrane-source， modified

Xiaochaihu Decoction

（小柴胡汤） plus Qinghao （

Artemisiae Annuae Herba

） could be used to expel pathogen through membrane and regulate

shaoyang

； for latent pathogen leading to

yin

fluids consumption， treatment should clear heat and expel pathogen， and prescribed with Chaihu （

Bupleuri Radix

）， Huangqin （

Scutellaria baicalensis Georgi

）， Qinghao （

Artemisia carvifolia

） combined with

Baihu Decoction

（白虎汤） or

Zhuye Shigao Decoction

（竹叶石膏汤） or

Qinghao Biejia Powder

（青蒿鳖甲散） or

Shengmai Decoction

（生脉饮） or

Siyin Decoction

（四阴煎） by syndrome differentiation； for latent pathogen leading to liver wind or reverse transmission to the pericardium， treatment should cool to open pathways， and prescribed with modified

Angong Niuhuang Pill

（安宫牛黄丸） to clear mind and open the orifices， clear heat and resolve toxins， resolve constraint with aromatics， and expel pathogens to outside； for fever after radiotherapy， chemotherapy or surgery for tumours， prescribed with self-prescribed

Fuzheng Anzhong Decoction

（扶正安中汤） plus

Xiaochaihu Decoction

（小柴胡汤） and modified

Qinghao Biejia Decoction

（青蒿鳖甲汤） to reinforce healthy

qi

and dispel pathogen， and support the middle

jiao

.