FIG. 2.

(a) Ratio between the fraction $n_Q$ of nodes saved by quarantine and the fraction of nodes $n_{\text{OP}}$ saved by preventive immunization as a function of the fraction $R$ of nodes in state R when quarantine is applied. The network is an Erdös-Rényi graph with $N={10}^5$ nodes. The curves are for growing values (top to bottom) of the spreading probability $p$. The dashed line indicates when the ratio is 1, i.e., the value discriminating between convenient quarantine (ratio $>1$) and inconvenient quarantine (ratio $<1$). (b) The same plot for a scale-free network with $\gamma =3$. (c) The same plot for a random geometric graph.