自然发病 meaning in English
natural occurrence
Examples
- Regrettably , in developed countries , about 230 , 000 persons in every million more than 1 in 5 die from naturally occurring cancer
在一些发达国家，每一百万人之中，便有约二十三万人超过五分之一机会死于自然发病的癌症。 - So far we have no sufficient evidence to testify the seeds naturally infected withthe pathogen in growing field can transmit this disease
作者通过大量的播种试验，到目前为止还末能证实来自自然发病田的种子常规越冬后能够传病，相关工作正在进行中。 - The histologic lesions were characterized by the remarkable atrophy of intestinal villi , basal vacuolation of enterocytes , increment of the crypt and the villus - to - crypt ratio had significantly decrease . compared with that of noninoculated control chicks . besides . intestinal villi become thin and flat . or cubic , also accompanied with necrosis . many villous enterocytes were detached from the lamina propria and the lamina propria contained a diffuse infiltrate of lymphocytes , plasma cells , macrophages . the characteristic ultrastructural changes observed by electronmicroscope were swelled mitochondria and dilated endo - plasticreticulum . ribosome on the surface of endo - plasticreticulum fall off and the number of ribosome within the cell decrease
动物回归试验中接种两周龄spf鸡， 24h后陆续发病，表现为持续性水样腹泻；剖检可见病鸡脱水、小肠内有大量的液体和气泡、肠粘膜变薄；组织学变化为肠绒毛上皮坏死、脱落，绒毛平均长度减少而隐窝深度增加，固有层中淋巴细胞浸润。其临床症状及病理组织学变化与自然发病相同。