In this paper, we propose and analyse a predator-prey model with disease
in prey. We assume that a portion of healthy prey takes refuge to avoid
predation. We find the biologically feasible equilibrium points and
their stability criteria by using linearization technique. We also
perform Hopf bifurcation analysis around the coexisting equilibrium
point. We carry out extensive numerical simulation to validate our
theoretical results and also explore rich dynamics which cannot be
attained analytically. We draw some one and two parameter bifurcation
diagrams which demonstrate rich dynamics like, Hopf bifurcation, chaos,
bistability, etc. We observe that invasion of disease in prey can
produce chaos through period-doubling bifurcation, whereas refuge can
control chaos via period-halving bifurcation. We also observe that
refuge can control disease prevalence in the prey population.