 The urogenital microflora of a healthy woman comprises approximately 50 species of organisms, which differ in composition according to the exposure to several factors. The flora of pregnant women is dominated by a variety of Lactobacillus species, which play an essential role in protecting them from genital infections 5. A deficiency in lactobacilli can upset the microbial balance in the vagina, which may result in an increased susceptibility for the colonization with pathogens such as GBS 6. As demonstrated by Gardnerella vaginalis, Lactobacillus strains can disrupt the biofilm of these pathogens in the in-vitro setting, which inhibits their growth 7. This led to the use of probiotics to populate the vagina with, in order to prevent or treat infections. The supplementation of probiotics that contain Lactobacillus strains has later been proven to improve cure rates and prevent recurrent infections 8. 