Basic research – Significance of detection and clinical impact of Candida albicans in non-immunosuppressed patients

Abstract

Background: The clinical significance of the detection of Candida albicans on mucous membranes of the respiratory or intestinal tract from patients in intensive care units is still not finally clarified. Many patients reveal colonization, although, despite increased risk, there are only a few invasive infections detectable. Therefore, antimycotic therapy in this setting is strongly discouraged. In reality, however, many patients receive antimycotics as a pre-emptive therapy. To elucidate this point, a literature research was performed. Results: In the light of new results on the pathogenicity of C.albicans, the recommendation not to treat should be discussed anew. Without becoming invasive, C.albicans influences the immune system negatively in an anti-inflammatory sense (Th2) by means of at least two distinct mechanisms [action on toll like receptors (TLR), production of farnesol], which will be discussed. Conclusion: It is believed that patients in the phase of CARS or MARS can be further endangered by concomitant colonization of mucous membranes by C.albicans, i.e., in the sense of an anti-inflammatory immune response. Treatment with azole preparations, like fluconazole, which interacts with ergosterol synthesis in this phase of the disease, may trigger an additional effect on the patient, through increase of farnesol concentration by way of a negative feedback. Results of animal experiments on the immune system and concomitant therapeutic consequences indicate the need for verification through clinical trials.