Serological survey and epidemiological investigation of maedi-visna in sheep in Finland
| Autor: | V Hirvelä-Koski, U.-M Kokkonen, L Nuotio, L Sihvonen |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Veterinary medicine
medicine.medical_specialty Visna virus animal diseases Secondary infection Antibodies Viral Microbiology Serology Visna Epidemiology Prevalence medicine Animals Serologic Tests Lung Finland Sweden Sheep General Veterinary biology General Medicine Serum samples biology.organism_classification Viral disease Flock Abattoirs Maedi-Visna |
| Zdroj: | Veterinary Microbiology. 65:265-270 |
| ISSN: | 0378-1135 |
| DOI: | 10.1016/s0378-1135(98)00312-5 |
| Popis: | A survey for antibodies to maedi-visna virus (MV) in the Finnish sheep surveillance flocks was conducted in 1994. Examination of a total of 12931 serum samples from animals over 1 year of age from 545 flocks (81% of all flocks) revealed eight seropositive flocks and the subsequent epidemiological investigation yielded one additional seropositive flock, indicating a low prevalence of 1.6%. The infection was very probably imported from Sweden in 1981, but it was not detected until the survey was conducted 13 years later. The entire primary infection flock was slaughtered in 1995. 77% of the sheep were seropositive but the animals were clinically healthy and only one (5%) of the contact flocks of the primary infection flock had contracted the infection. This secondary infection flock, 77% of which was seropositive, was slaughtered in 1994; however, animals in this flock had respiratory problems and the lungs of three sheep showed typical MV lesions. Seven (24%) of its contact flocks had contracted the infection and these each had one or two seropositive animals except for one flock which had seven (18%) seropositive animals. The results show that the initial spread of MV can be insidious and wide before infection is revealed in surveys or any clinical cases are encountered. |
| Databáze: | OpenAIRE |
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