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Loss of long-term control. Temporal postchallenge viral RNA copies (solid lines) and CD4 counts (dashed lines) in animals 4 (A) and 5 (B), which showed increases in viral loads at 196 weeks postchallenge. The shaded area at the right in each panel highlights data from 12 weeks to 5 years postchallenge. The background for detection of the plasma viral RNA was 500 until 12 weeks postchallenge and was then 300. The crosses indicate euthanasia.
