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[Histogenesis of leukemic changes in cows].

A Dimitrov, A Veselinova, N Pavlov

    Veterinarno-Meditsinski Nauki
    |January 1, 1985
    PubMed
    Summary
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    Bovine leukosis in cattle, confirmed by serologic tests, showed no clinical signs but histopathologic changes indicating reticuloendotheliosis. This suggests a potential link to delayed virus infections.

    Area of Science:

    • Veterinary Pathology
    • Immunology
    • Virology

    Context:

    • Bovine leukosis is a significant concern in cattle populations.
    • Serologic tests can detect infection, but clinical signs are often absent.
    • Histopathologic examination is crucial for understanding subclinical disease manifestations.

    Purpose:

    • To investigate the histopathologic findings in serologically positive cattle for leukosis without clinical symptoms.
    • To characterize the morphologic changes associated with subclinical bovine leukosis.
    • To explore the potential classification of bovine leukosis as a delayed virus infection.

    Summary:

    • Histopathologic analysis of lymph nodes and viscera from 98 cows and 28 heifers with positive serologic results for leukosis revealed no characteristic morphologic changes or clinical symptoms.

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  • Key findings included activation and proliferation of reticuloendothelial tissue in lymph node sinuses and visceral organ capillaries.
  • Metaplasia of connective tissue cells in lymph node trabeculae and vascular adventitial cells was also observed.
  • These changes suggest that bovine leukosis may manifest morphologically as reticuloendotheliosis.
  • The clinical course and morphologic presentation resemble other virus diseases classified as 'delayed virus infections'.

    • Impact:

    • This study enhances the understanding of subclinical bovine leukosis, aiding in more accurate diagnosis and disease management.
    • The findings contribute to the classification of bovine leukosis within the spectrum of viral diseases.
    • Identifies reticuloendotheliosis as a potential morphologic manifestation of bovine leukosis.