Herpes doesn't work like HIV In that respect.  We know that there is a very high rate of false positives on the IgG test and if both tests were done at LabCorp, then something weird is going on here.  If the first one was done at a different lab, then it is likely that they use different kits yielding different values and results.  The antivirals that you have taken are not going to cause the antibodies to be undetectable on the second test for most people but there is something called seroreversion with IgG test where it misses antibody it once picked up, and antivirals could contribute to that.---