Journal of Virology, November 1999, p. 9404-9412, Vol. 73, No. 11
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

University of California,
Received 17 March 1999/Accepted 9 July 1999
In human immunodeficiency virus (HIV)-infected patients treated
with potent antiretroviral therapy, the persistence of latently infected cells may reflect the long decay half-life of this cellular reservoir or ongoing viral replication at low levels with continuous replenishment of the population or both. To address these
possibilities, sequences encompassing the C2 and V3 domains of HIV-1
env were analyzed from virus present in baseline plasma and
from viral isolates obtained after 2 years of suppressive therapy in
six patients. The presence of sequence changes consistent with
evolution was demonstrated for three subjects and correlated with less
complete suppression of viral replication, as indicated by the rapidity of the initial virus load decline or the intermittent reappearance of
even low levels of detectable viremia. Together, these results provide
evidence for ongoing replication. In the remaining three patients,
virus recovered after 2 years of therapy was either genotypically
contemporary with or ancestral to virus present in plasma 2 years
before, indicating that virus recovery had indeed resulted from
activation of latently infected cells.
*
Corresponding author. Mailing address: Stein Clinical
Research Building No. 326, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0679. Phone: (619) 552-8585, ext. 7193. Fax: (619) 552-7445. E-mail: j2wong{at}ucsd.edu.
Present address: University of Zürich, Zürich, Switzerland.
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