The phase transition lines in pair approximation for the basic reinfection model SIRI

For a spatial stochastic epidemic model we investigate in the pair approximation scheme the differential equations for the moments. The basic reinfection model of susceptible-infected-recovered-reinfected or SIRI type is analysed, its phase transition lines calculated analytically in this pair approximation. (C) 2007 Elsevier B.V. All rights reserved.