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Detection of inapparent Aleutian disease virus infection in mink.

The normal serum gamma-globulin centration of mink from the Ontario Veterinary College field station was 13.2 +/- 2.6% of total serum proteins. Mink serum gamma-globulin concentrations above 21%, which represented 3 standard deviations above the normal mean, were considered to be hypergammaglobulinemic. About 39% of pastel mink infected naturally with Aleutin disease virus (ADV) exhibited an inapparent or nonprogressive infection. These nonprogressivley infected mink had serum gamma-globulin values below 21% andhad antibody titers less than 256 if tested by the couterimmunoelectrophoresis technique. Mink maintained inapparent infection for at least 10 months after infection with ADV. Neither gross nor histopathologic changes were present in the mink with inapparent ADV infection. The virus persisted in blood, mesenteric lymph nodes, kidney, liver, and spleen of mink with non-progressive infection, although the amount of virus present probably was small.