Our expert says:
The blood tests test for Herpes antibodies, which does not always test positive early in the infection. The blood test can only determine whether a person has been previously infected by HSV and has produced antibodies to the virus and is not an indication of an acute infection. The swab may be more specific. See also http://www.herpes-coldsores.com/herpes_tests.htm
Herpes is not easy to diagnose but if you have the typical blisters when you have the rash, plus the positive swab, you probably have had a herpes infection (it is the same virus that gives cold sores of the mouth and can be transferred from the mouth to the vagina)
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