You'd need to provide water for humanity for this period somehow. Water supplies have to be sterile and available. (That is assuming everyone goes on a week lon

You'd need to provide water for humanity for this period somehow. Water supplies have to be sterile and available. (That is assuming everyone goes on a week long secluded water fast. It's harder if not everyone can fast. There's a problem with keeping people in care but not insoluble.) That is just for rhinoviruses too, there are other viral reasons of common cold, more hardy than this, and bacterial diseases that mimic it very precisely.