RT Journal Article SR Electronic T1 Group B streptococcal infection: when does vertical transmission take place? JF Archives of Disease in Childhood - Fetal and Neonatal Edition JO Arch Dis Child Fetal Neonatal Ed FD BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health SP F46 OP F47 DO 10.1136/fn.73.1.F46 VO 73 IS 1 A1 C. A. Michie A1 R. Blumberg YR 1995 UL http://fn.bmj.com/content/73/1/F46.abstract AB Expression of CD45 isoforms was used to estimate when group B streptococci had infected a child born with low Apgar scores who subsequently died. The measure suggested that infection was present more than 24 hours before delivery, thus distinguishing perinatal infection as the primary event which preceded intrapartum asphyxia in this case.