Leishmania

例句：

1. 1. The disease is caused by the parasite Leishmania.
   这种疾病是由寄生虫利什曼原虫引起的。
2. 2. The patient was diagnosed with leishmaniasis.
   病人被诊断出患有利什曼原虫病。
3. 3. Researchers are studying the effects of Leishmania on human health.
   研究人员正在研究利什曼原虫对人类健康的影响。