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Opioid modulation of host resistance to infectious diseases is well documented; however, not much is known during visceral leishmaniasis (VL). Low doses of morphine, administered subcutaneously in Leishmania donovani-infected BALB/c mice, on days 0 and +15, significantly (p < 0.05) suppressed (1 mg/kg/day) or even sterile-cleared (2 mg/kg/day) the infection; paradoxically, high doses (10 and 30 mg/kg/day)...
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