But why would intestinal worms have this effect?

肠内蠕虫为什么会产生这样的效果呢？

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Intestinal worms have been shown to do so on many occasions.

已经有多次情况显示肠道蠕虫有这种影响。

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Mr Thomas was born in penury and grew up with bare feet and intestinal worms.

托马斯出身微寒，伴着光脚丫儿、肚里住着蛔虫的日子长大。

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OneWorld Health is currently developing medicines for diarrheal diseases, malaria, visceral leishmaniasis and soil-transmitted helminthes (intestinal worms).

FORBES: Can Non-Profit Drug Companies Cure Diseases of Poverty?

Intestinal worms are estimated to affect up to two billion people around the world, mainly in poor areas.

BBC: Worms detected by converted iPhone microscope

They then used it to diagnose intestinal worms in about 200 students in Pemba Island, off Tanzania's eastern coast.

CNN: STORY HIGHLIGHTS