Longitudinal analysis of the vaginal microflora in pregnancy suggests that L. crispatus promotes the stability of the normal vaginal microflora and that L. gasseri and/or L. iners are more conducive to the occurrence of abnormal vaginal microflora.
Hans Verstraelen, Rita Verhelst, Geert Claeys...
https://pubmed.ncbi.nlm.nih.gov/19490622