Trade-off Model

Chapter 9:  The “Trade-Off Model” of parasite/pathogen evolution tries to explain how parasite fitness is influenced by various fitness components. Match the following symbols with the corresponding components of the model:

Question 7 options:

host death rate induced by parasite

number of secondary infections that result from a primary infection

Population size

rate at which host clears infections

transmission rate of parasite (probability it will be transmitted from one host to another)

1.

Ro

2.

  (Greek letter Beta)

3.

N

4.

(Greek letter Alpha)

5.

γ (Greek letter Gamma)