Study seems inconclusive!! Seems like it might have something to do with if the floor is clean or filthy…
LOOK: http://news.nationalgeographic.com/news/2014/03/140315-five-second-rule-bacteria-food-safety/
http://news.nationalgeographic.com/news/2014/03/140315-five-second-rule-bacteria-food-safety/
http://en.wikipedia.org/wiki/Escherichia_coli