Abstract
Bovine immunodeficiency-like virus (BIV) was first isolated in 1972 (M. J. VanDerMaaten et al., J. Natl. Cancer Inst. 49:1649-1657, 1972). Much work has been done on the molecular characterization of BIV in studies using the original BIV R29 isolate; however, R29 is believed to be attenuated since it no longer causes either mononuclear cell number increases or detectable enlargement of lymphatic nodules in experimentally infected cattle. The host cell tropism and changes in host peripheral blood lymphocyte populations following infection with BIV are unknown. Recently, we isolated and characterized a field isolate of BIV, FL112 (D. L. Suarez et al., J. Virol. 67:5051-5055, 1993) that causes a transient, mononuclear cell lymphocytosis in experimentally infected cattle. In the present study, cattle were inoculated with BIV FL112, and data from flow cytometry showed that BIV causes a B-cell lymphocytosis with no consistent, significant changes in other mononuclear cell populations, including CD3+, CD4+, and CD8+ cells. Cell sorting and PCR amplification were used to show that BIV may be pantropic. Proviral DNA was present in CD3+, CD4+, CD8+, and B-cells, monocytes, and WC1 cells (gamma/delta T cells, null cells) by 3 to 6 days postinoculation and also at 2.5 years postinoculation.
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