A piece of your food falls to the floor. "5, 4, 3, 2, 1". Can you still eat it without getting food poisoning,rabies, or scabies? The "five second rule" is no dirty little secret- it's a practice a lot of people use when they mistakenly drop something from a meal or snack.
The biology department at American University tested it scientifically in June to determine whether it's a myth or reality. They selected two samples of food: bologna and gummy bears. They first slapped many pieces of bologna on the floor and household furniture including public couches. The bologna stayed on each surface for five seconds. Afterwards, they did the same procedure with gummy bears. The samples were all placed in an isolated incubation for a short period.
At first glance, the results were a bit repulsive. Bologna that hit the floor was contaminated with bacteria that could have been salmonella. One gummy bear picked up ecoli bacteria from the public couch.
The good news is that most samples were okay, and those that were laced with germs and bacteria didn't have enough harmful levels that normal people with regular immune systems couldn't fight.
Bottom line: The "five second rule" sticks. It'll just be a dirty little secret between you, the food, and the bacteria from around your house.