Table 1.

Variable and parameter descriptions for the MRSA model (1) per day

Variable	Description
UN,UL,UH	Population of uncolonized non-IDUs, low-risk IDUs, and high-risk IDUs
CN,CL,CH	Population of colonized non-IDUs, low-risk IDUs, and high-risk IDUs
IN,IL,IH	Population of infected non-IDUs, low-risk IDUs, and high-risk IDUs
Parameter	Description
πN, πL, πH	Natural birth rate
βN,βL,βH	Transmission probability per contact with colonized or infected population
σN,σL,σH	Progression rate of colonized population
γN,γL,γH	Recovery rate of infected population
τN, τL, τH	Decolonization rate of colonized population
ωN,ωL,ωH	Increased IDU risk behavior
αN,αL,αH	Decreased IDU risk behavior
μ	Natural death rate
δN,δL,δH	Death rate due to disease