We propose an equilibrium model for defaultable bonds that are subject to contagion risk. Contagion arises because agents with ‘fragile beliefs’ are uncertain about the underlying economicstate and its probability. Estimation on sovereign European CDS data shows that agents require a time-varying risk premium for bearing state uncertainty. The model outperforms affine specifications with the same number of state variables, suggesting that there are important nonlinearities in credit spreads that are captured by our model. Contagion drives most of the variation in CDS spreads, especially before the crisis. However, economic fundamentals accountfor a significant fraction during the crisis.