Question

According to the S-I-R model of parasite and host dynamics, how does the number of infections change over time if new susceptible individuals are born into the population at regular intervals?

1) The number of infected individuals increases until everyone is infected.
2) The number of infected individuals fluctuates in a cyclical pattern.
3) The number of infected individuals stays constant regardless of new births.
4) The number of infected individuals decreases continuously over time.

Answer 1

The number of infected individuals fluctuates in a cyclical pattern according to the S-I-R model of parasite and host dynamics when new susceptible individuals are born into the population at regular intervals.

Step-by-step explanation:

The number of infected individuals fluctuates in a cyclical pattern

according to the S-I-R model of parasite and host dynamics, when new susceptible individuals are born into the population at regular intervals. This model is used to study the dynamics of infectious diseases. It divides the population into three categories: Susceptible (S), Infected (I), and Recovered (R).

As new susceptible individuals are born into the population, they enter the susceptible category, which increases the number of susceptible individuals over time. As the susceptible individuals interact with infected individuals, they can become infected and move from the susceptible category to the infected category. However, as infected individuals recover, they move from the infected category to the recovered category, reducing the number of infected individuals. This continuous movement between categories results in fluctuations in the number of infected individuals over time.