The funny thing is that, that's what everyone would do.....and...its the worse thing you can do.
If we're talking crazy virus that infects people in mere seconds, moving is the last thing you wanna do. What you want to do is find a defense area and stay put, if everyone did this then the infectious disease won't spread as rapidly.
People running and moving around would spread the virus like wildfire. Set up a defense area and wait it out until the virus has died off.