Chlamydial infections are transmissible as long as the infection is present. Since untreated infections, go away within a few months, rarely a year or more, that is the maximum time the infection can be transmitted. When the infection is diagnosed and treated, transmissibility ends almost immediately after start of the antibiotic.
Thank you very much for the help. It does alleviate my fears. I do have one question out of curiosity. If someone is infected with chlamydia and specifically LVG how long are they contagious? Are they contagious until they have been treated with antibiotics or does the contagion last only a certain period of time?
Thanks again.
Welcome to the STD forum.
There are no worries about lymphogranuloma venereum (LGV) in this situation. First, no chlamydial infection is known to persist 15 years; the longest ever documented was 4 years. (Some web sites might speculate persistence for 20 years, but that's all it could be -- speculation). Second, LGV generally doesn't cause asymptomatic infection; if your partner had it, he would have known -- and you would have known if you were infected. Third, LGV has always been an extremely rare STD in the United States, with never more than 100 cases per year in the entire country (and most of the time 10 or fewer cases). I realize you are concerned about a possible South American origin, but even there LGV has been very rare in the past few decades.
HSV-2, the cause of genital herpes, could last 20 years, but I don't really think you need testing for it. Human papillomavirus sometimes can last that long, but there is no test for HPV except for regular pap smears -- if your paps have been normal, you have no worries there.
In summary, I see no reason for you to worry you might have any STD dating back to your exposure 15 years ago, and for sure no worries about LGV.
I hope this helps. Best wishes-- HHH, MD