When hookworms sink their teeth into the intestinal wall, they secrete chemicals that blunt the immune system.

当十二指肠虫将牙齿嵌到肠壁，它们会分泌化学物质使得免疫系统迟钝。

Some studies suggest that hookworms can treat allergies, which may be another reason allergies are more common in industrialized countries where hookworms are few and far between.

研究认为十二指肠虫能够治疗过敏，这也解释了为什么过敏在工业化的国家更见那儿的十二指肠虫相对较少。

Some of the proposed reasons are flatworm and hookworm infection, H. Pylori infection, gastrointestinal bleeding and their vitamin intake being disrupted by the incorporation of modern high-starch foods to the diet.

其中原因是扁虫和钩虫感染、幽菌感染、胃肠道出血以及由于在饮食中加入现代高淀粉食物而中断了维生素的摄入。

Being infected by hookworms, roundworms, bacteria like H. Pylori and other pathogens, getting wounded from accidents or animal attacks, ticks, leeches and so on would all be great ways to lose blood and iron for paleolithic humans.

被钩虫，蛔虫，像幽旋菌这样的细菌和其他病原体感染，被意外伤害或动物攻击，蜱虫，水蛭等等都是旧石器时代的人类失去血液和铁的好方法。