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Journal of Clinical Microbiology, January 2006, p. 138-142, Vol. 44, No. 1
0095-1137/06/$08.00+0     doi:10.1128/JCM.44.1.138-142.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Development and Evaluation of a Rapid Latex Agglutination Test Using a Monoclonal Antibody To Identify Candida dubliniensis Colonies

Groupe d'Etude des Interactions Hôte-Parasite, UPRES EA 3142, UFR des Sciences Pharmaceutiques et d'Ingénierie de la Santé, 16 Boulevard Daviers, 49 100 Angers,¹ SR2B, ZI Carrière Beurrière, 49 240 Avrillé, France²

Received 20 July 2005/ Returned for modification 12 September 2005/ Accepted 12 October 2005

Cell components of the dimorphic pathogenic fungus Candida dubliniensis were used to prepare monoclonal antibodies (MAbs). One MAb, designated 12F7-F2, was shown by indirect immunofluorescence to be specific for a surface antigen of Candida dubliniensis yeast cells. No reactivity was observed with other fungal genera or with other Candida species, including Candida albicans, that share many phenotypic features with C. dubliniensis. The use of different chemical and physical treatments for cell component extraction suggested that the specific epitope probably resides on a protein moiety absent from C. albicans. However, we failed to identify the target protein by Western blotting, owing to its sensitivity to heat and sodium dodecyl sulfate. MAb 12F7-F2 was further used to develop a commercial latex agglutination test to identify C. dubliniensis colonies (Bichro-dubli Fumouze test; Fumouze Diagnostics). The test was validated on yeast strains previously identified by PCR and on fresh clinical isolates; these included 46 C. dubliniensis isolates, 45 C. albicans isolates, and other yeast species. The test had 100% sensitivity and specificity for C. dubliniensis isolated on Sabouraud dextrose, CHROMagar Candida, and CandiSelect media and 97.8% sensitivity for C. dubliniensis grown on Candida ID medium. The test is rapid (5 min) and easy to use and may be recommended for routine use in clinical microbiology laboratories and for epidemiological investigations.

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