Just to let you know that being around the person alone is transferring the virus onto the other person, although kissing increases the rate at which the germs are passed over, I would say a standard 3 - 5 days, excluding the incubation time of the virus, but then again you should consider, that after the viral infection , bacterial infections might take over.. So I would say kissing is fine during the 4th or 5th day of continuos medication and resting.