Abstract
The herpesvirus of malignant catarrhal fever (MCFV) was isolated from the spleen of 2 3 rabbits 4 days after the intravenous inoculation of infectious lymph node suspension, while no virus could be isolated at 2 and 6 days post inoculation (p.i.). Indirect immunofluorescence identified the antigen-positive cells at 4 days p.i. as medium sized lymphocytes lying in the venous sinuses of the spleen, lower numbers of fluorescing cells being seen in the paracortical areas of lymph nodes and in the thymus. Scanty fluorescence, without isolation of virus, was evident in the spleen at 6 days p.i. but by day 8 p.i. virus could be isolated irregularly from spleen and lymph nodes and at 12 days p.i. was found in all lymphoid tissues in those rabbits with lymphadenitis and pyrexia. The primary replication in the spleen at 4 days is compared with other herpes induced lymphoproliferative disorders.
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