Level 6 allows them to confiscate firearms I'll bet.
I agree with the other poster about preventing large gatherings. level 5 might be stopping of movement. When they close the schools, it might be too late. I wonder what the boys at Fort Detrick are doing? If you see them running for the hills, it might be all over but the shouting. John Ringo has a now chilling book on this called The Last Centurion that talks of a liberal response to a bird flu plus massive global cooling event with a President who sounded a lot like Hillary.
From my cold dead hands, perhaps...