14 Epidemiological models
The study of the spread of epidemics is based on the notion that a disease is conveyed by contact between an infected individual and an uninfected individual who is susceptible to the disease. An endemic state is reached if a finite fraction of the population is infected. A state where (almost) all the population is infected is called a pandemic state. Similarly, this notion may describe the spread of a computer virus through a network of computers.
In previous chapters we surveyed the subject of attacks on networks, by targeting individuals either randomly or intentionally. In particular, the Internet ...