-How is this possible? Have you came across any situations like this?
Yes, I have, and he could be testing negative for a number of different reasons. First, if he has been taking antiviral medicine during this time period, that can definitely interfere with the antibody test. Next, the IgG test Mrs. 8% of HSV-2 infections compared to the gold standard herpes Western blot. So the test to simply have missed his infection.
a positive and typed smog test from an active lesion should be accepted as the final determiner of infection.
-Is it possible to still be a carrier of herpes even though you test negative on igg test?
Yes, see above
-if a person tests negative on an igg test, how confident can they be that they are not a carrier of hsv1 or hsv2?
With a positive swab test, the IgG results should be ignored