Abstract
A 10-week-old infant with a group B streptococcal meningitis is described. On admission there were only slight signs of meningeal involvement. The illness was diagnosed by immunoelectroosmophoresis (IEOP) of cerebrospinal fluid (CSF) and confirmed by culture of group B streptococci. Treatment with benzylpenicillin was instituted with rapid improvement of the child's condition. IEOP is proposed as a complement to routine methods when CSF from newborns and small children is examined.