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Herpes Simplex Virus (HSV) IgG antibodies are immune proteins that may develop after exposure to herpes simplex virus, including HSV-1 and/or HSV-2. IgG antibodies usually appear later than IgM and can remain detectable for a long time. A positive result may indicate previous exposure to HSV, but this marker does not show whether the infection is active or distinguish between HSV-1 and HSV-2.

