roundworms

• For example , a large quantity of roundworms in the intestines can cause intestinal obstruction ; cysticercus cellulosa can apply pressure to the brain tissues , causing epilepsy ; intestinal flukes stick to the mucosa of the intestine with suckers , which can cause inflammation , hemorrhaging or even destruction of intestinal tissue
  2机械性作用：寄生虫可通过阻塞压迫和直接损害，而对宿主造成危害，例如小肠内有大量蛔虫寄生时，可导致肠梗阻。猪囊尾蚴可压迫脑组织引起癫痫发作，姜片虫用吸盘吸附在肠粘膜上，可造成炎症出血，乃至糜烂等。