十二指肠钩虫（Ancylostoma duodenale ） z 寄生于人的小肠内，大多生活一年。雌虫长 10mm—13mm ，雄虫 8mm—11mm ， 口囊发达，腹侧有 2 对钩齿，背侧有一对三角形齿...
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两种寄生虫为十二指肠钩虫和美洲轮虫引起钩虫病。
Two parasites Ancylostoma duodenale and Necator americanus cause hookworm disease.
十二指肠钩虫第4期幼虫口腔的长宽几乎相等，但美洲钩虫宽大于长。
In the 4th stage larvae, the length of mouth cavity of A. duodenale is almost equivalent to its width, but that of N. americanus is shorter.
采集安徽和四川两省的十二指肠钩虫，用PCR技术扩增COI基因，同时测序并用MEGA软件进行遗传差异的分析。
COI genes of hookworm was amplified from hookworm genomic DNA by PCR and sequenced. Program MEGA was used for the sequence analysis.
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