Mansfield L S, Gamble H R, Baker J S, Lichtenfels J R
Helminthic Diseases Laboratory, Agricultural Research Service of the USDA, Beltsville, MD 20705.
J Am Vet Med Assoc. 1993 Feb 15;202(4):601-6.
First-stage larvae of Protostrongylus rufescens were detected in the feces of a ram with diarrhea, anorexia, weight loss, and mucopurulent nasal discharge. Subsequently, a survey was initiated in the experimental sheep flocks maintained at the Agricultural Research Service's Helminthic Diseases Laboratory in Beltsville, Md to determine the extent and effect of infection with the parasite. Five of 31 ewes and 4 of 16 rams were found to be infected with the lungworm. Clinical signs of infection, which ranged from mild to severe, included diarrhea, weight loss, and respiratory distress. Natural transmission of the parasite to parasite-naive lambs grazing on pasture occurred during the course of this study. Three lambs born to infected ewes during this study were not infected, suggesting that there is no vertical transmission. Additionally, cattle grazing the same pastures as infected sheep were not infected with the parasite. Results of this study indicated that Protostrongylus rufescens can cause serious disease in domestic sheep in the United States and should be considered as a differential diagnosis in sheep with nonspecific respiratory tract signs.
在一只出现腹泻、厌食、体重减轻和黏液脓性鼻分泌物的公羊粪便中检测到了红原圆线虫的一期幼虫。随后，在美国马里兰州贝尔茨维尔农业研究局蠕虫病实验室对饲养的实验羊群展开了一项调查，以确定该寄生虫感染的程度和影响。在31只母羊中有5只、16只公羊中有4只被发现感染了肺线虫。感染的临床症状从轻度到重度不等，包括腹泻、体重减轻和呼吸窘迫。在本研究过程中，该寄生虫自然传播到了在牧场上放牧的未感染过寄生虫的羔羊身上。在本研究期间，3只感染母羊所生的羔羊未被感染，这表明不存在垂直传播。此外，与感染绵羊在同一牧场放牧的牛未感染该寄生虫。本研究结果表明，红原圆线虫可在美国家养绵羊中引发严重疾病，在出现非特异性呼吸道症状的绵羊中应将其视为鉴别诊断的对象。
