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. Author manuscript; available in PMC: 2017 Oct 1.
Published in final edited form as: J Math Anal Appl. 2016 Apr 19;442(1):171–188. doi: 10.1016/j.jmaa.2016.04.039

Figure 3.

Figure 3

Backward bifurcation arising from the change of β12. Blue solid line-stable, red dashed line-unstable. Two diseases can coexist even if each one dies out independently.