在研究土壤、水、蔬菜和日常用具被蠕虫卵污染的程度时,往往必須决定卵的生活能力和侵襲性,因为大量的虫卵在外界多已死亡,因此它們在蠕虫病流行病学上并沒有意义。蠕虫卵若已显著变化,則易于根据形态来决定其生活能力;卵壳破裂,卵向內凹,空壳,由卵內跑出幼虫,胚的細胞浆呈混濁或呈空泡狀——这些都是死卵的标志。 In studying the extent to which soil, water, vegetables, and utensils are contaminated with worm eggs, it is often necessary to determine the viability and invasiveness of the eggs, since a large number of eggs are dead in the outside world and therefore they are epidemiologically Pointless. If the worm eggs have been significantly changed, it is easy to determine its viability according to the morphology; eggshell rupture, eggs concave, shell, eggs run out of larvae, the embryo cytoplasm was cloudy or vacuolar - these Are the signs of dead eggs.