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Concurrent infection of Maedi-Visna with lung worms and pulmonary adenomatosis in sheep kept in Debre Berhan Sheep Improvement Station, Central Ethiopia

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Abstract

The study was conducted with the objectives of determining the possible causes of pneumonia in the sheep and to characterize the microscopic lesions of concurrent infection of Maedi-Visna with lung worms and other infectious pneumonia. Detailed gross and microscopic examinations were employed on 35 Maedi-Visna seropositive sheep. Out of 35 sheep slaughtered and examined for gross lesions on their lungs, lung worms, fibrinous adhesions, and mottling on the cranioventral lobes were observed with decreasing order of frequency. Histopathologically, the pneumonic lungs (n = 35) revealed Maedi (100%), Maedi-Verminous pneumonia complex (28.57%, n = 10), Maedi bronchopneumonia complex (17.14%, n = 6), and Maedi-pulmonary adenomatosis complex (2.86%, n = 1). The occurrence of high proportion of concurrent infection of Maedi-Visna with lung worms and bacteria strongly suggest synergy of the pathogens and the presence of several stress factors including wind draft, unusually chilly weather and poor management in the area that are known to predispose the improved sheep breeds to respiratory disease complex. On top of culling by slaughter of Maedi-Visna seropositive sheep, regular deworming, redesigning the house, and vaccination of sheep with the available vaccines should be carried out timely at least to reduce the severity of Maedi-Visna induced loss.

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Acknowledgements

The authors would like to thank the Debre Berhan Sheep Multiplication and Breed Improvement Center for the provision of the necessary information and cooperation during field work. Special thanks also extend to the National Animal Health Diagnostic and Investigation Center (NAHDIC) staffs for provision of transport, working space, and technical support during laboratory work. Much of our acknowledgements also go to Dr. Alemnesh Woldeyes for her guidance and technical support during the laboratory work.

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Authors and Affiliations

  1. School of Veterinary Medicine, Hawassa University, P.O.Box 05, Hawassa, Ethiopia

    Berhanu Mekibib

  2. Field Veterinarian, Ministry of Livestock and Fisheries Resources, Oromia, Ethiopia

    Meron Samuel

  3. College of Veterinary Medicine and Agriculture, Addis Ababa University, P.O.Box 34, Debre Zeit, Ethiopia

    Tilaye Demisse

  4. National Animal Health Diagnostic and Investigation Center (NAHDIC), PO Box 04, Sebeta, Ethiopia

    Getnet Abie

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  1. Berhanu Mekibib
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  2. Meron Samuel
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  3. Tilaye Demisse
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  4. Getnet Abie
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Correspondence to Berhanu Mekibib.

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The authors declare that they have no conflict of interest.

Ethical approval

Ethical clearance was obtained from Hawassa University School of Veterinary Medicine Research Ethical Review Committee and from the National Research Ethical Review Committee, Ministry of Science and Technology. Official permission was also obtained from Amhara Region Agriculture Bureaus and from the center. All the animals were slaughtered in a humane manner to reduce their suffering and pain. This article does not contain any studies with human participants performed by any of the authors.

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Mekibib, B., Samuel, M., Demisse, T. et al. Concurrent infection of Maedi-Visna with lung worms and pulmonary adenomatosis in sheep kept in Debre Berhan Sheep Improvement Station, Central Ethiopia. Comp Clin Pathol 27, 933–938 (2018). https://doi.org/10.1007/s00580-018-2684-7

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  • DOI: https://doi.org/10.1007/s00580-018-2684-7

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