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Journal of Clinical Microbiology, February 2000, p. 902-904, Vol. 38, No. 2
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Growth Competition between Candida dubliniensis and Candida albicans under Broth and Biofilm Growing Conditions

W. R. Kirkpatrick,1,* J. L. Lopez-Ribot,1 R. K. Mcatee,1 and T. F. Patterson1,2

Departments of Medicine, The University of Texas Health Science Center at San Antonio,1 and Audie Murphy Division, South Texas Veterans Health Care System,2 San Antonio, Texas 78284

Received 17 August 1999/Returned for modification 28 September 1999/Accepted 15 November 1999

Seven isolates each of Candida albicans and Candida dubliniensis were paired (11 pairs) and examined for competitive interaction. Equal numbers of CFU of each competitor were inoculated into Sabouraud dextrose broth and incubated at 37°C with vigorous shaking under conditions favorable to either broth or biofilm growth. Surviving proportions of each competitor were calculated from the broth culture at 24 and 96 h and the biofilm culture at 96 h, with species differentiation done on CHROMagar Candida medium. C. albicans had a competitive advantage over C. dubliniensis in broth culture and under biofilm growing conditions; however, with the presence of a supporting structure for biofilm formation, C. dubliniensis was able to better withstand the competitive pressures from C. albicans.

* Corresponding author. Mailing address: The University of Texas Health Science Center at San Antonio, Department of Medicine, Division of Infectious Diseases, 7703 Floyd Curl Dr., San Antonio, TX 78284-7881. Phone: (210) 567-4823. Fax: (210) 567-4670. E-mail: KIRKPATRICK{at}UTHSCSA.EDU.

Journal of Clinical Microbiology, February 2000, p. 902-904, Vol. 38, No. 2
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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