What do you mean?
If you are still sick, don't kiss anyone, have sex, etc.
Aj
what if you're almost better like very close to being not contagious?
Yes you can make out with someone with mono and not get it. You also can make out with someone with mono and not get visibly ill. I think it's 90% of us have EBV - the virus that causes mono by the time we reach our 40's. It's THAT common.
That said - when someone has mono or is ill - it's usually not the best idea to be making out with them until they are better.
grace
yes, kissing the person once for a matter of seconds gives you a low risk of getting it, i had mono 4 times this year mixed with tonsilitis, can you say OUCH