This technical note studies output feedback stabilization of nonlinear networked control systems (NCSs) under multirate sampling. Network induced constraints are modeled as norm-bounded uncertainties and a general framework for multirate nonlinear NCS design is established. Under standard continuity and consistency assumptions, we analyze dissipativity of the proposed multirate output feedback structure in the presence of channels uncertainties and disturbance inputs. Our result is then applied to preserve input-to-state stability (ISS) in a semiglobal practical sense and also to derive sufficient conditions that guarantee exponential stability of the uncertain multirate NCS in the absence of disturbances.