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. 2015 Jun 3;10(6):e0126893. doi: 10.1371/journal.pone.0126893

Fig 1. Dynamic compartmental model for HIV transmission among Chinese MSM.

Fig 1

B represents the rate at which MSM enter into the HIV susceptible class (S). MSM infect HIV at a rate of ω, progress through four stages of HIV infection (I1-I4) at a corresponding rate ρi (i = 1–4), and then die of HIV/AIDS (D). μ1 represents the rate at which MSM leave the model for having no more same-sex behaviors or non-HIV related death. HIV positive MSM in each stage of HIV infection, excluding the acute stage (I1), are tested and put on ART at a corresponding rate τi (i = 2–4). After they receive ART, they may exit the model at a rate of μi (i = 2–4) for having no more same-sex behaviors or death. They may also stop treatment or the treatment may fail, in which case they return to the corresponding non-ART state at a rate φi (i = 2–4).