. >> all of the other monkeys -- the control monkeys that were given a looethal dosef ebola died, allf the animals that were vaccinated survived. >>> inspector of ebola will confront some students returning to american colleges and universities this fall. ebola screen willing be in place for west african students including in illinois and georgia. >>> coming up, america moving on from hurricane katrina. the constant reminders of the storm's devastating impact. >>> nine years ago this morning hurricane katrina slammed louisiana and mississippi. it was a catastrophe in new orleans, 80% of the city was underwater after the levies failed. more than 1800 were killed and thousands displaced. today the big easy and the gulf coast region continues to recover from the once in a generation storm. and jennifer martin reports most have moved on from katrina but will never forget. >> this was where we took that talk and this was all sand. >> reporter: these people feel 20 years of friendship, but the four frightening hours they spent clinging to a tree to survive put them in to a bond that is hard