Domestic poultry is infected when they come into direct / indirect contact with faeces or nasal secretion of infected wild birds 家禽与感染后的野生鸟类排泄物或鼻内分泌物直接/间接接触后也会被感染。
Two hours after laying eggs , the secretions disappear , and the surfaces of cellular membranes break in a sort , but most of the organelle retain integrity and cellular inclusions appear in oviduct cavity 产卵后2小时,管腔内分泌物消失,细胞膜表面稍有破裂,但细胞器大部分保持完整。产卵后1天,管壁细胞解体较产卵后2小时明显,管腔内出现细胞内含物。