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Feline immunodeficiency virus (FIV) is similar to human immunodeficiency virus type 1 virologically and induces a clinical syndrome in cats comparable to human immunodeficiency virus type 1 syndrome in humans. To determine the lymphoid target cells of FIV, populations of CD4+ lymphocytes, CD8+ lymphocytes, and CD21+ lymphocytes (B cells) were enriched to more than 96.5% purity and then analyzed for FIV provirus by semiquantitative DNA amplification. We found FIV provirus in CD4+, CD8+, and B lymphocytes. In cats infected for   1 log10 higher in acutely infected cats than in chronically infected cats, primarily because of a higher level of CD4+ infection in the acutely infected cats. A comparison of proviral loads in mesenteric lymph node and peripheral blood mononuclear cells in acutely or chronically infected cats revealed no significant difference. A kinetics study of FIV infection demonstrated that all lymphocyte subpopulations were infected by 4 weeks postinoculation. Virus was isolated from CD4+, CD8+, and B cells in vitro, and reverse transcriptase PCR demonstrated that all subsets contained viral RNA in vivo and therefore are productive reservoirs for FIV.

Proviral burden and infection kinetics of feline immunodeficiency virus in lymphocyte subsets of blood and lymph node