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Six rhesus macaques were adapted to morphine dependence by injecting three doses of morphine (5 mg/kg of body weight) for a total of 20 weeks. These animals along with six control macaques were infected intravenously with mixture of simian-human immunodeficiency virus KU-1B (SHIV(KU-1B)), SHIV(89.6P), and simian immunodeficiency virus 17E-Fr. Levels of circulating CD4(+) T cells and viral loads in the plasma and the cerebrospinal fluid were monitored in these macaques for a period of 12 weeks. Both morphine and control groups showed precipitous loss of CD4(+) T cells. However this loss was more prominent in the morphine group at week 2 (P = 0.04). Again both morphine and control groups showed comparable peak plasma viral load at week 2, but the viral set points were higher in the morphine group than that in the control group. Likewise, the extent of virus replication in the cerebral compartment was more pronounced in the morphine group. These results provide a definitive evidence for a positive correlation between morphine and levels of viral replication.

Modulation by Morphine of Viral Set Point in Rhesus Macaques Infected with Simian Immunodeficiency Virus and Simian-Human Immunodeficiency Virus