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. Author manuscript; available in PMC: 2008 Dec 1.
Published in final edited form as: Math Biosci. 2007 Jul 20;210(2):576–597. doi: 10.1016/j.mbs.2007.07.001

Figure 1.

Figure 1

The three-state “disease space” X= {N, A, S} with transition probabilities p,q,r for the normal, inoculation, and drug-treatment steps. N = not infected; A = asymptomatic; S = symptomatic.