title: Natural transmission of group B Streptococcus during delivery.
abstract: This is a study of group B Streptococcus during labor of 121 patients in whom group B Streptococcus was isolated in the vagina and/or rectum before delivery. The intrapartum vaginal culture was positive in 55.2% of the antepartum carriers (32/58). When the vaginal culture during delivery was positive, the group B Streptococcus was isolated in the amniotic fluid 2 h after the rupture of membranes in 81% of the cases. The newborns of antepartum carriers, when the labor developed naturally, were colonized by group B Streptococcus in 69.2% of cases when the intrapartum vaginal and/or amniotic fluid cultures were positive (9/13), while only 5.6% of the newborns of antepartum carriers but with negative cultures during delivery were colonized by group B Streptococcus (1/18). The most frequent positive neonatal culture was in the umbilicus (83.3%) followed by the external ear (62.5%).
authors.affiliation: Departamento de Obstetricia y Ginecologia, Hospital La Paz, Facultad de Medicina, Universidad Autonoma de Madrid, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Matorras
authors.forename: A
authors.initials: A
authors.lastname: Garcia-Perea
authors.forename: J A
authors.initials: JA
authors.lastname: Usandizaga
authors.forename: F
authors.initials: F
authors.lastname: Omeñaca
mesh_terms: D000653:Amniotic Fluid / Q000382:microbiology; D005260:Female; D006801:Humans; D007231:Infant, Newborn / Q000382:microbiology*; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious; D012007:Rectum / Q000382:microbiology; D013290:Streptococcal Infections / Q000635:transmission*; D013292:Streptococcus agalactiae / Q000302:isolation & purification*; D014621:Vagina / Q000382:microbiology*