Fig. 2

SIS-model with resistant and non-resistant hosts and wild-type and escape-type pathogens. SIS-model with resistant and non-resistant hosts (Blue subsystem), pathogens either of the wild type (subscript W) or that can escape host resistance (subscript E; Orange subsystem), and infection of hosts with both types of pathogen (Green subsystem). For explanation of symbols, see Table 1. \({I}_{W}\) and \({I}_{E}\) denote the total number of individuals infected with a wild-type and escape pathogen, respectively, and are the sum taken over both host types, where \({I}_{W}={I}_{NW}+{I}_{RW}\) and \({I}_{E}={I}_{NE}+{I}_{RE}\) respectively