Spreading Question
Consider a pathogen spreading on a highly heterogeneous contact network whose degree distribution follows a power law with exponent 2 < γ < 3 2 < \gamma < 3 . Based on network epidemic theory and immunization strategies, which of the statements below is correct ? A) In networks with 2 < γ < 3 2 < \gamma < 3 , the epidemic threshold λ c \lambda_c is positive. Therefore, random immunization is sufficient to stop the epidemic if at least 30% of the population is vaccinated. B) Strategies that immunize the acquaintances of randomly selected individuals tend to target high-degree nodes, increasing the epidemic threshold. C) The strategy of immunizing acquaintances of random individuals does not improve epidemic control in real networks, because there is no correlation between the degree of a node and the degree of its neighbors. D) For networks with ⟨ k 2 ⟩ → ∞ \langle k^2 \rangle \to \inf , SI and SIS models have the same epidemic threshold, sinc...