The vagina as an ecologic system. Current understanding and clinical applications.

Recent advances in understanding the mechanisms of dominance of the healthful microecology by Lactobacillus acidophilus through microbicidal enzyme systems has led to renewed interest in ecologic approaches to vaginal health maintenance and treatment of vaginosis and vaginitis. Review of pertinent research suggests that due to inadequate adherence of lactobacilli from dairy sources, contaminants in commercial sources, and lack of evidence of effectiveness in sparse clinical trials, intravaginal applications of L. acidophilus cannot be recommended. Bacterial vaginosis is described in this article as a microecologic shift in the dominant organism of the microecology from L. acidophilus to Gardnerella vaginalis. This results in conditions favorable to vaginal establishment of many anaerobic organisms. The ability to identify and nurture healthful lactobacilli in the vaginal microflora is suggested as a future direction for health-enhancement-oriented research, practice, and screening.