Finally, the Imperial College team ran the numbers a third time, this time assuming a "suppression" strategy.  In addition to isolating symptomatic cases and quarantining their family members, they also simulated social distancing for the entire population.  All public gatherings and most workplaces shut down.  Schools and universities close.  (Note that these simulations assumed a realistic rate of adherence to these requirements, around 70-75% adherence, not that everyone follows them perfectly.)  This is basically what we are seeing happen in the United States today.