Germy Answers: Bye-Bye, Five-Second Rule

by Leigh Ann Otte

“Five-second rule!” Munch, munch, munch.

How many times have you said that? Guess what. That ol’ rule? Probably not real. Yeah.

Infectious-disease specialist Shirley Tozzi, M.D., writes in this week’s featured article:

A study in the April 2007 Journal of Applied Microbiology found that salmonella could survive up to 28 days on a dry surface and be transferred “almost immediately on contact.” Other less scientific studies have found different results. It likely just depends on what’s on your floor (which doesn’t have to be visibly dirty to be contaminated).

Want more virus and bacteria answers? Like, why don’t antibiotics work on viruses? Check out the article here: “Fascinating Facts About Germs: Viruses, Bacteria, Antibiotics.”

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Leigh Ann Otte is the managing editor of This information is not meant to be individual advice. Please consult your doctor for that. See our disclaimer here.

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