Pinto, AlbertoStollenwerk, NicoGouveia Martins, José MariaMartins, José2025-04-022025-04-022009-09Martins, J., Pinto, A., & Stollenwerk, N. (2009). A scaling analysis in the SIRI epidemiological model. Journal of Biological Dynamics, 3(5), 479–496. https://doi.org/10.1080/175137508026010581751-3758http://hdl.handle.net/10400.8/12742AMS Subject Classification: 34A34; 92D30; 92D25.For the spatial stochastic epidemic reinfection model SIRI, where susceptibles S can become infected I , then recover and remain only partial immune against reinfection R, we determine the phase transition lines using pair approximation for the moments derived from the master equation. We introduce a scaling argument that allows us to determine analytically an explicit formula for these phase transition lines and prove rigorously the heuristic results obtained previously.engstochastic processesreinfection modelpair approximationphase transition linesjournal articlehttps://doi.org/10.1080/175137508026010581751-3766