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. Author manuscript; available in PMC: 2016 May 1.

Published in final edited form as: Math Biosci. 2015 Feb 26;263:121–132. doi: 10.1016/j.mbs.2015.02.007

The tragedy of the commons under targeted treatment. a) The probability of an individual being infected by agent $P - J_{P}^{(i)}$ , b) the individual disutility due to both diseases – $J^{(i)} = D_{P} J_{P}^{(i)} + D_{C} J_{C}^{(i)}$ . The parameter values are as in the text. The horizontal axis is the community level of targeted treatment rate and the vertical axis is the level of targeted treatment rate chosen by an individual within the community.