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The 'Five Second Rule' Is a Myth
Date:7/26/2012

THURSDAY, July 26 (HealthDay News) -- People who follow the "five-second rule" may be better off sticking to the phrase, "when in doubt, throw it out."

So says Dr. Jorge Parada, medical director of the infection prevention and control program at Loyola University Health System. Parada cautioned that as soon as something touches an unclean surface, it picks up dirt and bacteria.

"A dropped item is immediately contaminated and can't really be sanitized," said Parada in a health system news release. The amount of bacteria and what type of microbes are involved depend on the object that is dropped and where it falls, he added.

Rising off contaminated items with water may not clean them entirely, but it could significantly reduce the amount of bacteria on it, Parada noted.

"Maybe the dropped item only picks up 1,000 bacteria, but typically the inoculum, or amount of bacteria that is needed for most people to actually get infected, is 10,000 bacteria -- well, then the odds are that no harm will occur," he said.

That's not the case for items that are "cleaned" by licking them off or putting them in the mouth.

"That is double-dipping," Parada explained. "You are exposing yourself to bacteria and you are adding your own bacteria to that which contaminated the dropped item. No one is spared anything with this move."

There are levels of contamination, Parada noted. More harmful bacteria can make people sicker, more quickly. He added that a potato chip dropped for just a second on a relatively clean table is likely to be less contaminated than one that falls on the floor and stays there for a while. Parada noted that some items will pick up microbes more easily than others.

"In the same time period, a rock candy is less likely to pick up contamination than a slice of cheese," explained Parada, who is also a professor at Loyola's Stritch School of Medicine.

Although there is some truth to the idea
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