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J. Virol., 04 1995, 2328-2332, Vol 69, No. 4
LJ Diehl, CK Mathiason-DuBard, LL O'Neil and EA Hoover
Cats infected with feline immunodeficiency virus (FIV) develop a disease
syndrome similar to that caused by human immunodeficiency virus type 1
(HIV-1) infection in humans. HIV-1 replication has been shown to correlate
with the disease stage and progression. To assess replication kinetics and
disease progression in early FIV infection, we developed a quantitative
competitive reverse transcriptase PCR to measure the plasma virus load at
serial time points after virus exposure. We found that an early peak
viremia immediately preceded the onset of acute- phase symptoms in infected
cats. Plasma virus levels remained high throughout the symptomatic phase of
infection, which lasted for 8 to 10 weeks, and then declined as clinical
symptoms resolved; however, all cats maintained significant plasma virus
titers through 36 weeks postinfection. Early peak viral replication
coincided with the initial precipitous decline in circulating CD4+ T
lymphocytes. These results indicate that FIV kinetics are similar to those
of HIV-1 during the acute and secondary phase of infection and that the
plasma FIV load correlates with the disease stage. These results serve to
further develop the FIV model and to enhance its usefulness for
pathogenesis, vaccine development, and therapeutic studies related to HIV.
Copyright © 1995, American Society for Microbiology
Longitudinal assessment of feline immunodeficiency virus kinetics in plasma by use of a quantitative competitive reverse transcriptase PCR
Department of Pathology, Colorado State University, Fort Collins 80523.
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