Fig. 5: Regions of qualitatively different co-evolutionary patterns when the fitness cost of immune investment is fixed and variable.
From: On maternity and the stronger immune response in women

Fixed immunity costs are those experienced in all cases (with or without infection) and best reflect innate immunity costs. Variable immunity costs are those experienced with infection only and best reflect adaptive immunity costs. Results are based on c0 = 0.5, bmax = 3.5, βmax = 3.1, d = 4 and μ = 0.1. See Methods for an explanation of model parameters. Source data are provided as a Source Data file.