Graduate Thesis Or Dissertation
 

Viral causes of pneumoenteritis in lambs in western Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2z10wt36x

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  • One hundred and fourty-one lambs showing signs of pneumonia and/or enteritis from four different flocks in western Oregon were sampled for virus isolation. Two ovine adenoviruses, antigenically distinct from each other and from bovine adenoviruses, were isolated from the nasal mucosa and feces of two lambs. The lambs were showing signs of pneumonia (475N isolate) and enteritis (47F isolate). A serological survey was performed using sera from the lambs sampled for virus isolation and adult sheep from 3 of the 4 flocks. The sera were tested for antibodies against the 475N virus and 47F virus as well as some selected bovine viruses (PI-3, IBR, BVD, and adenoviruses types 3, 6 and 8). Adult sheep from 19 other Oregon flocks were also tested for antibodies to the two ovine adenoviruses. Positive antibody titers to 47F and 475N viruses were detected in 73% and 29% respectively of sheep in flocks outside of those sampled for virus isolation. The incidence of positive antibody titers in adult sheep from those flocks sampled fro virus isolation was 54% for 47F and 98% for 475N. Sheep also had low levels of antibodies to PI-3, IBR, BVD, BA-3 and BA-8. A preliminary pathogenicity study using isolates 475N and 47F was completed with six lambs of varying ages and histories as subjects, (three lambs were inoculated with each virus). The 475N virus produced a proliferative bronchopneumonia that was moderately severe. The 47F isolate produced lesions of a mild interstitial pneumonia but did not produce severe signs of pneumonia or enteritis in the lambs. Both viruses were recovered from the tissues taken from the lambs at necropsy.
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