**Universal Behavior in a
Generalized Model of Contagion**

**Outline**

**Motivation**

**What do we mean by
“contagion”?**

**What kinds of contagion are
there?**

**Classes of Contagion Models**

**Graphically:**

**The Problem**

**Model Description**

**Model Description**

**Infection probability**

**Dose Response Examples**

**Recovery and
Re-Susceptibility**

**Steady-State Dynamics**

**Collective Dynamics**

**Results: **

1. Homogeneous
Systems

**Graphically**

**2. Heterogeneous Systems**

**Graphically**

**Transitions Between Classes**

**Graphically**

**Hybrid Classes**

**Example of Hybrid Class (I
and III)**

**More Hybrid Classes**

**Conclusions**

**Importance of P**_{k}

**Problems and Extensions**

**Slide 28**