Before revision: Disorder is a characteristic of real social networks generated by heterogeneity in person-to-person interactions . This property affects the way a disease spreads through a population, reaches a tipping point in the fraction of infected individuals, and becomes an epidemic.
After revision: Disorder is a characteristic of real social networks generated by heterogeneity in person-to-person interactions are known to be heterogeneous, which can affect the way a disease spreads through a population, reaches a tipping point in the fraction of infected individuals, and becomes an epidemic.