以下为句子列表：
英文: Most visceral leishmaniasis cases are concentrated in poor populations in just a few countries: India, Bangladesh, Nepal, Sudan and Brazil.
中文: 大多数内脏型利什曼病例都集中在少数几个国家的贫民区：印度、孟加拉、尼泊尔、苏丹和巴西。
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英文: 【abstract】 many advantages and principles of nucleic acid vaccine were reviewed in detail. the progress of its application and studies on malaria, schistosomiasis, cysticercosis and leishmaniasis were mentioned briefly.
中文: 本文较为详细地叙述了核酸疫苗的优点、作用机理，简略介绍了核酸疫苗在疟疾、血吸虫病、囊虫病和利什曼原虫病的应用与研究进展。
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