Another group , the endoparasites , including tapeworms , threadworms protozoa , and other organisms , live in the body cavities , intestines , organs and cells of their hosts 另一种为体内寄生虫，寄生在宿主的腔道组织内或细胞内，如某些蠕虫和原虫皆属于这一类。
2.
Content : avermectins are a class of drugs which have been found wide usage against a board spectrum of nematodes and arthropods , many of which are important endoparasites and ectoparasites of animals . avermectin bi is a common agriculture pesticide produced by the actinomycete streptomyces avermitilis and registered for worldwide use 正文：阿维菌素类药物( avermectins ， avms )属大环内酯类抗生素，由于其优异的驱虫活性和较高的安全性，被视为目前最为优良、应用最广泛的兽用驱虫药。
