Containing with anhoterishin B and the carrier which the medicine manufacture study it can allow, remedy method of the true germ infection symptom of the mammal which features that anhoterishin B substantially is pure in the remedy method of the true germ infection symptom of the mammal which consists of the fact that it prescribes the remedy effective quantity of the composition which becomes.アンホテリシンBと製薬学的に許容し得る担体とを含有してなる組成物の治療有効量を投与することからなる哺乳動物の真菌感染症の治療方法において、アンホテリシンBが実質的に純粋であることを特徴とする哺乳動物の真菌感染症の治療方法。