Yes, I think for a disease / contagion it would be necessary to stop all unnecessary social interaction. Become a hermit until it gets under control, but how would you know for sure when it was under control? The way the media is anymore could you trust what you were hearing over the tv or radio?
A lot of people get tunnel vision when preparing for emergencies and only concentrate on what they think is most likely to happen. Being adaptable and being able to "think on your feet" are the most important things to have.