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Figure 1 | BMC Infectious Diseases

Figure 1

From: Modelling the impact of chlamydia screening on the transmission of HIV among men who have sex with men

Figure 1

Flow diagram of the model describing transmission of HIV and chlamydia. The population consists only of men who have sex with men (MSM). The solid black arrows show infection with chlamydia and the solid red arrows show infection with HIV. HIV-infected MSM not in care may “enter care” and move to the class of HIV-infected MSM in care (dashed red arrows) after a positive HIV-test and registration at one of the specialised HIV treatment centres. Recovery from chlamydia infection (with or without treatment) is shown with dashed black arrows. For the variables X ij the first subscript denotes status of HIV infection (0, not infected with HIV; 1, HIV-infected not in care; 2, HIV-infected in care), while the second subscript denotes status of chlamydia infection (0, no chlamydia infection; 1, symptomatic chlamydia; 2, asymptomatic chlamydia). The yellow shaded area denotes MSM not infected with HIV, the blue shaded area denotes HIV-infected MSM not in care, and the pink shaded area denotes HIV-infected MSM in care.

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