It's all over the news, but I don't see a rush for buying supplies in our area (Pacific Northwest).
We heard on the news last night that North Korea has missiles that have the ability to hit our coast. That scares me more than anything.
I am going to be sure we have bottled water and batteries. Other than that, I doubt there is really much we can do to protect ourselves from airborne bacterias or other airborne entities. They can come in through chimneys, and cracks anywhere in the house. One expert said that duct tape sales are helping hardward stores, but will do little to keep a family safe.