Adaptive SIS Epidemic — Awareness-Behavior Coevolution

Network — node color: S=blue, I=red, A=aware (yellow rim)

Parameters

Infection rate β: 0.30 Recovery rate γ: 0.10 Awareness rate α: 0.20 Forgetting rate ω: 0.05 Contact reduction κ: 0.50 N nodes: 80

State

Susceptible S—

Infected I—

Aware A—

R₀ (effective)—

Threshold βc—

Aware individuals reduce contact by factor (1-κ). Awareness spreads from infected neighbors (rate α) and decays (rate ω).

Behavioral feedback raises the epidemic threshold. Above critical awareness, the epidemic self-extinguishes even for β > β_c^(no awareness).