Robustness of the network models of immune response

We introduce a quantitative measure of the robustness of the network models of immune response against damage of inter-cellular interactions. As an illustrative example, we compute the robustness of a model which is equivalent to the one proposed recently by Chowdhury and Stauffer (J. Stat. Phys. 59 (1990) 1019). We also study the basins of attraction of the fixed points of this model with damaged inter-cellular interactions.