CD4 and tuberculosis: • 3 macrophage populations: resting, Mtb infected, HIV-infected• 2 CD4+ T cell populations: HIV-infected and HIV-uninfected• 2 CTL populations: Mtb-specific and HIV-specific• Model TB and HIV simultaneously• Latent TB infection then HIV infection• HIV infection then TB infection• One compartment – lung• No Mtb-HIV coinfected cells