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J. Virol., Oct 1995, 6149-6157, Vol 69, No. 10
Copyright © 1995, American Society for Microbiology

Induction of accelerated feline immunodeficiency virus disease by acute- phase virus passage

LJ Diehl, CK Mathiason-Dubard, LL O'Neil, LA Obert and EA Hoover
Department of Pathology, Colorado State University, Fort Collins 80523, USA.

Development of feline immunodeficiency virus (FIV) infection in cats as a small animal model for lentiviral immunodeficiency disease has been hampered by the prolonged and variable disease course following experimental infection. To address this issue, we generated high-titer, unselected FIV stocks by pooling plasma from cats acutely infected with a subgroup C FIV isolate designated CABCpadyOOC (FIV-C-PGammer). Subsequent infection with this virus pool resulted in rapidly progressive, fatal disease in greater than 50% of infected cats. Accelerated FIV disease was characterized by rapid and progressive CD4+ T-cell loss, lymphadenopathy, weight loss, lymphoid depletion, and severe thymic atrophy. Mortality and rate of disease progression were affected by the age of each cat at infection and whether the virus source animal was in the acute or chronic stage of infection. The rapid FIV disease syndrome was consistently associated with systemic lymphoid depletion, clinical disease, and susceptibility to opportunistic infections, analogous to accelerated and/or terminal HIV-1 infection. The results of this study demonstrate that FIV infection is a valid small animal model for lentiviral immunodeficiency disease.

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