生物性传播的传播形式有哪些？
病原体在吸血节肢动物体内经过发育、繁殖后，性传形式才有传染性。传播
这种传播有以下三种形式：①叮咬传播：吸血节肢动物在吸血时，生物将病原体由口器注入人或动物体内，性传形式如疟原虫在按蚊体内完成有性生殖后，传播在按蚊吸血时引起感染。生物
②粪便或体液传播：如流行性斑疹伤寒，性传形式立克次体在虱肠内繁殖后，传播随虱粪排出，生物带有病原体的性传形式虱粪或体液侵入破损皮肤而引起传染。但虱咬无传染性。传播
③经卵传代传播：如森林脑炎、生物恙虫病等。性传形式病原体在蜱、传播螨体内经卵传代，下一代有先天性传染性，通过叮咬能引起传播。
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