Leishmania donovani

例句：

1. 1.The disease is caused by the Leishmania donovani parasite.
   这种疾病是由利什曼原虫引起的。
2. 2. Researchers are studying the genetics of Leishmania donovani to develop new treatments.
   研究人员正在研究利什曼原虫的遗传学，以开发新的治疗手段。
3. 3. The patient was diagnosed with leishmaniasis, a serious form of the disease.
   这名患者被诊断出患有利什曼病，这是一种严重的疾病形式。