We model the disease transitions between the three disease states for CA-MRSA: colonized (denoted by C), uncolonized (denoted by U), and infected (denoted by I). The uncolonized state corresponds to the state S and infected to state I in the SIR model, Equation (1). Colonized is an additional compartment cor- responding to an asymptomatic state in which an individual has measurable levels of CA-MRSA but ex- hibits no symptoms. An individual transitions between pairs of these states and is susceptible to repeated colonizations and infections. Figure 1 summarizes the CA-MRSA disease states and transitions in the CA-MRSA ABM.