Investigation of Possible Nosocomial-Associated Invasive Group B Streptococcus Disease Using Whole-Genome Sequencing: A Report of 3 Cases.

We investigated possible nosocomial transmission of 3 invasive cases of Group B Streptococcus serotype III disease in newborns delivered in the same facility. All cases were of the same sequence type and clonal complex. Genomic variation was detected within the core genome and capsular region, indicating different sources of acquisition.