Incidence of invasive infections with Group B streptococcus in adults in Norway 1996–2019: a nationwide registry-based case–control study

Group B streptococcus (GBS) colonizes the gastrointestinal and vaginal mucosa in healthy adults, but has also become an increasing cause of invasive infection. The aims of this study were to describe the incidence and factors associated with the occurrence of invasive GBS disease in adults in Norway.