In the nuclei of 4% of peripheral blood or spleen mononuclear cells (MNC), Aleutian disease virus (ADV)-specific antigens were found by a direct immunofluorescence test. The MNC were further fractionated by nylon wool, affinity chromatography using Staphylococcus aureus protein, or Percoll gradient techniques. ADV and specific antigens were detected in MNC fractions enriched in either the B or T lymphocytes. In the bone marrow, up to 40% antigen-positive cells were demonstrated over a period of 15 months. These findings were confirmed by the detection of infectious virus in the MNC of blood and spleen and in bone marrow cells. Adherent cells from mink and control cells from ADV-negative ferrets were negative in both tests. These findings indicate that ADV exhibits a lymphotropism and can persist in the B- and T-cell fractions from ADV-infected mink over a long period of time. Furthermore, co-cultivation of mink MNC and bone marrow cells with the CCC clone 81 cells was shown to be a reproducible method for the detection of ADV in persistently infected mink.

Keywords:
Aleutian disease virus, Mink, Persistent infection, Lymphocytes
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© 1984 S. Karger AG, Basel
1984
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