Labor National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine pregnancy female male Infant Prospective Studies fetal death newborn induced Retrospective Studies Abortion time factors pregnancy complications infectious / etiology* fever / etiology streptococcal infections / epidemiology gestational age penicillin resistance streptococcal infections / complications birth weight premature gentamicins / pharmacology septic / etiology sepsis / etiology vagina / microbiology penicillins / pharmacology streptococcus agalactiae / isolation & purification* pmid:1097038 pmc1673355 doi:10.1136/bmj.2.5970.533 t m reid diseases / etiology* kanamycin / pharmacology puerperal infection / etiology streptococcus agalactiae / drug effects