In this paper. we present a multi-scale co-affection model of HIV infection and opioid addiction. The population scale epidemiological model is linked to the within-host model which describes the HIV and opioid dynamics in a co-affected individual. CD4 cells and viral load data obtained from morphine addicted SIV-infected monkeys are used to validate the within-host model. https://www.ealisboa.com/great-deal-Pentair-Union-Collar-2-U11-200PS-super-offer/