Social distancing—from mobility restrictions to complete lockdowns—can take many weeks, possibly even months, a potentially devastating outcome for social and economic stability. One of the challenges is that the sick cannot be selectively isolated, since many of the spreaders remain pre-symptomatic for a period ranging from several days to as much as two weeks—invisible spreaders who continue to be socially active. Hence, it seems that without a population-wide lockdown isolating the carriers cannot be achieved effectively.