Why don't cold sores spread to the opposite lip?

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Offline thedoc

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Why don't cold sores spread to the opposite lip?
« on: 17/09/2012 21:30:01 »
IB Chemistry  asked the Naked Scientists:
   
Hi,

This seems to have stumped the science teachers here where I work

Why can a cold sore transfer easily to other parts of your body (and other people too), but does not seem totransferfrom one lip to the other?

Love the show, listen to every one !

Richard Thornley

Chemistry Teacher, NYC

What do you think?
« Last Edit: 17/09/2012 21:30:01 by _system »