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"My daughter had mononucleosis and is wondering when she can kiss her boyfriend again without infecting him?"

The person with mono should avoid kissing or sharing saliva with others until their symptoms have completely resolved. Even after feeling better, they may still be contagious to some extent as the virus can remain dormant in the body and may be released in saliva at times. It is best to consult a healthcare professional for more information on when it is safe to resume kissing without risking transmission of the virus.