Larval distribution and histopathology of experimental Strongyloides ransomi infection in young swine.

W M Stone, C F Simpson
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Abstract

Necropsy at various intervals of three week old pigs following experimental infection with larvae of Strongyloides ransomi showed distribution of the larvae through the body during the first 24 hours. Quiescent larvae at the 24 hour necropsy, as indicated by higher recovery before and after this period may be an indication of physiological changes preceding a moult. Whether or not a moult occurs in the lung prior to migration of the larvae to the intestine has not been determined. At the 72 hour necropsy, larvae were largely confined to the lung and juvenile worms were beginning to appear in the small intestine. Migration to the small intestine was completed by the 96 hour necropsy. Lesions were observed in the skin and lungs up to the 96 hour necropsy, and lymphocytic accumulations were observed in the skin and lungs to this point and lymphocytic accumulations were observed in the liver to the 72 hour necropsy. At 28 days post-application lung lesions were still evident and the duodenum and jejunum were heavily parasitized. Egg passage began on the sixth day post-application and peaked on the 12th day.

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猪体内实验性圆形线虫感染的幼虫分布及组织病理学。
三周龄猪实验感染蓝氏圆线虫幼虫后不同时间间隔的尸检显示,幼虫在最初24小时内通过身体分布。24小时尸检时静止的幼虫,在这段时间前后恢复较高,可能表明蜕皮前的生理变化。在幼虫迁移到肠道之前,肺部是否会发生蜕皮尚未确定。在72小时的尸检中,幼虫主要局限于肺部,幼虫开始出现在小肠中。在96小时的尸检中完成了小肠的迁移。尸检96小时前皮肤和肺部可见病变,此时皮肤和肺部可见淋巴细胞积聚,尸检72小时前肝脏可见淋巴细胞积聚。用药后28天肺部病变仍明显,十二指肠和空肠大量寄生。施卵后第6天开始传代,第12天达到传代高峰。
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