Labor National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine pregnancy research support u.s. gov't adult female Infant Comparative Study Prospective Studies newborn P.H.S. Antibodies Immunoblotting pregnancy complications l corey herpesvirus 1 human / immunology* herpesvirus 2 human / isolation & purification viral / blood* herpes genitalis* / diagnosis infectious* / diagnosis pmid:9262493 doi:10.1056/nejm199708213370801 z a brown s selke herpes genitalis* / epidemiology herpes genitalis* / virology herpes simplex / mortality obstetric infectious* / epidemiology infectious* / virology pregnancy outcome* serologic tests