Given the task definition and input, reply with output. You are given a sentence in Japanese. Your job is to translate the Japanese sentence into English.

この小さな寄生虫がマラリアを引き起こしますおそらく今まで知られている中で最も複雑かつしたたかな病原体です

This little parasite that causes malaria, it's probably one of the most complex and wily pathogens known to humankind.