If you ask them, they will swear that they've never had herpes. Most, though not all, of those infections are on the genitalia. I have also seen herpes on the foot and behind the knee, as well as on the fingers. Many of those people who test positive have never had, or have never known they had, an actual outbreak of herpes. What this means is that you can be infected with the virus but have no sores.
People carry both viruses for their entire lifetimes.
The person shedding the virus may have a sore at the time, but often does not, and therefore does not know that he or she is shedding. If no sore is present, it's called asymptomatic shedding. I don't believe anyone knows how many cases of herpes are caught from someone who has asymptomatic shedding. Also, I don't believe there is any evidence that catching the virus from someone who is shedding asymptomatically is more or less likely to produce symptoms in the person catching it. There is a great deal that doctors still do not know about herpes and its transmission, and indeed about many viruses and bacteria.