Published in Women's Health Weekly, July 12th, 1999
The results are the first good news in a long time for proponents of testing live HIV vaccines. Recently, people naturally infected with a naturally occurring nef-deleted mutant have had declines in CD4 lymphocyte counts after remaining immunologically normal for extended periods (see accompanying story).
The highly attenuated vaccine, SIVmac239 delta4, lacks its nef, vpr, vpx, and upstream sequences (US) in the U3 region of its genome.
"We are encouraged that a strain...
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