[Maternal carriage and vertical transmission of group B Streptococcus (GBS)].

The pneumonia, sepsis and meningitis are common diseases of GBS infection in infants. There are early-onset and late-onset types in this disease, the result of the infection is unknown. M. Sugiyama reported that M9 is a new type of GBS in Japan in 1989. Analysis of GBS typing and serum specific antibody concentrations of the type are simple with new technics. By studying the infants' contamination we discovered that GBS appeared to originate from mother-infant sources. The infants were followed for a year. 52% of the infants had GBS contamination in their throat or stool. The most common type was Ia, followed by III, JM9 and NT6. Those types without III type had been present for more than 9 months in the infant. The contamination term of Ia or III type in infants correlated with the blood specific antibody concentration of the type.