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Effect of Candida albicans infection and clotrimazole treatment on vaginal microflora in vitro.

AbstractOBJECTIVE:
To determine the effect of Candida albicans infection and clotrimazole treatment on vaginal microflora.
METHODS:
Studies were conducted using a model simulating the healthy vaginal ecosystem. The model consisted of a mixed culture of Lactobacillus acidophilus, Staphylococcus epidermidis, Prevotella bivia, and group D Streptococcus sp grown in continuous culture in a chemically defined medium. The status of the model was assessed using a mathematical equation that determines the probability a microflora is normal or abnormal.
RESULTS:
Challenge of the model with C albicans was followed within 24 hours by the development of microbial populations representing an abnormal microflora. Treatment of the system with clotrimazole (100 micrograms/mL) resulted in a decrease in C albicans counts to 0 within 48 hours. However, treatment also altered other components of the vaginal microflora, which did not return to normal. Addition of clotrimazole (100 micrograms/mL) to the system in the absence of C albicans also resulted in an abnormal model by 24 hours.
CONCLUSIONS:
Candida albicans infection of the vaginal ecosystem, as represented by this in vitro model, has a deleterious effect on members of the normal microflora. Clotrimazole, although effective against C albicans infection, also has a deleterious effect on components of the normal vaginal microflora. One of the implications for women using clotrimazole for microbiologically undocumented vaginal yeast infections is an increased risk of infection or disease through the disruption of the protective microflora barrier.
AuthorsR A Ross, M L Lee, A B Onderdonk
JournalObstetrics and gynecology (Obstet Gynecol) Vol. 86 Issue 6 Pg. 925-30 (Dec 1995) ISSN: 0029-7844 [Print] United States
PMID7501341 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Antifungal Agents
  • Clotrimazole
Topics
  • Antifungal Agents (therapeutic use)
  • Candidiasis (drug therapy, microbiology)
  • Clotrimazole (pharmacology, therapeutic use)
  • Female
  • Humans
  • Models, Biological
  • Vagina (drug effects, microbiology)

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