The ‘Five Second Rule’ Is a Myth

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 that exposure to some
contaminants could help build up a healthy immune system, Parada advised
people to avoid putting themselves at unnecessary risk.

“There actually is certain research that supports the importance of
being exposed to bacteria at critical times in a child’s development,”
Parada said. “But I believe this development applies to exposures of
everyday living. I do not advocate deliberately exposing ourselves to
known contaminants. That would probably be a misplaced approach to
building up our defenses. If you want to be proactive in building up your
defenses, eat right, exercise, and [get] adequate sleep — and remember to
get your vaccines.”

More information

The U.S. National Institutes of Health has more about immune response.

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