Clinical variability of recurrent oral HSV-1 infection with a high level of serum IgG antibody: Three case reports.

Recurrent HSV-1 infection has various clinical features. This case report addresses three differences in the oral clinical manifestation of HSV-1 with the same high level of IgG titers reaching 200 U/mL. IgG antibody level indicates the state of recurrency but does not correlate with clinical features.