Quorum sensing (QS) is means of communication used by bacteria within a population. Many species of bacteria use QS to coordinate gene expression in relation to the density of the population.
Group B Streptococcus agalactiae (GBS) is a human commensal bacterium of the gastrointestinal tract and vaginal mucosa of many healthy individuals. However, in new-borns this bacterium causes a life-threatening infection with increasing rates of antibiotic resistance.
Further details: Bacterial gene expression control at population level