Partial Immunity SIRS Model

🧠 Conceptual Overview In advanced mathematical epidemiology, the Partial Immunity SIRS Model extends the classic waning-immunity SIRS framework by recognizing that immunity is rarely all-or-nothing. Following recovery, individuals often retain residual immune protection that reduces—but does not eliminate—their susceptibility to reinfection. This mechanism is fundamental for understanding long-term endemic persistence, reinfection cycles, and antigenic drift … Read more