Plasmodium is a protozoan which causes malaria; it is the causative agent of the disease . 瘧原蟲是引起瘧疾的原生動物;是疾病的病原體。
In unsuccessful transmission experiments the causative agent could not be passed through bacteria-retaining filters . 在失敗的傳染實(shí)驗(yàn)中,致病因子不能通過細(xì)菌濾器。
Causative agent : candida , a type of yeast fungus 病原:念珠菌霉菌真菌之一種