Before revision:  Our results call for the need for contact tracing to go both backward and forward, in multiple steps, to leverage all forms of positive biases .  Using simulations on networks with a power-law degree distribution , we show that this deep contact tracing can potentially prevent almost all further transmissions even at a small probability of detecting infected individuals  .
After revision:  Our results call for the need for contact tracing to go both backward and forward, in multiple steps, to leverage all forms of positive biases . Using simulations on networks with a power-law degree distribution , we show that this deep contact tracing can potentially prevent almost all further transmissions even at a small probability of detecting infected individuals , strategically executed contact tracing can prevent a significant fraction of further transmissions .