  When an epidemic spreads in a population, individuals may adaptively change
the structure of their social contact network to reduce risk of infection. Here
we study the spread of an epidemic on an adaptive network with community
structure. We model the effect of two communities with different average
degrees. The disease model is susceptible-infected-susceptible (SIS), and
adaptation is rewiring of links between susceptibles and infectives. The
bifurcation structure is obtained, and a mean field model is developed that
accurately predicts the steady state behavior of the system. We show that an
epidemic can alter the community structure.
