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Journal of Clinical Microbiology, October 1998, p. 3007-3012, Vol. 36, No. 10
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Detection of Candida dubliniensis in
Oropharyngeal Samples from Human Immunodeficiency Virus-Infected
Patients in North America by Primary CHROMagar Candida Screening
and Susceptibility Testing of Isolates
William R.
Kirkpatrick,1
Sanjay G.
Revankar,1,2
Robert K.
Mcatee,1
Jose L.
Lopez-Ribot,1
Annette W.
Fothergill,2
Dora I.
McCarthy,2
Stephen E.
Sanche,2
Rebecca A.
Cantu,1
Michael G.
Rinaldi,1,2,3 and
Thomas F.
Patterson1,3,*
Departments of
Medicine1 and
Pathology,2 The University of Texas
Health Science Center at San Antonio, and
South Texas
Veterans Health Care System, Audie L. Murphy
Division,3 San Antonio, Texas 78284
Received 14 May 1998/Returned for modification 16 June
1998/Accepted 7 July 1998
Candida dubliniensis has been associated with
oropharyngeal candidiasis in patients infected with human
immunodeficiency virus (HIV). C. dubliniensis isolates may
have been improperly characterized as atypical Candida
albicans due to the phenotypic similarity between the two
species. Prospective screening of oral rinses from 63 HIV-infected
patients detected atypical dark green isolates on CHROMagar Candida
compared to typical C. albicans isolates, which are light
green. Forty-eight atypical isolates and three control strains were
characterized by germ tube formation, differential growth at 37, 42, and 45°C, identification by API 20C, fluorescence, chlamydoconidium
production, and fingerprinting by Ca3 probe DNA hybridization patterns.
All isolates were germ tube positive. Very poor or no growth occurred
at 42°C with 22 of 51 isolates. All 22 poorly growing isolates at
42°C and one isolate with growth at 42°C showed weak hybridization
of the Ca3 probe with genomic DNA, consistent with C. dubliniensis identification. No C. dubliniensis isolate but only 18 of 28 C. albicans isolates grew at
45°C. Other phenotypic or morphologic tests were less reliable in
differentiating C. dubliniensis from C. albicans. Antifungal susceptibility testing showed fluconazole
MICs ranging from
0.125 to 64 µg/ml. Two isolates were resistant to
fluconazole (MIC, 64 µg/ml) and one strain was dose dependent
susceptible (MIC, 16 µg/ml). MICs of other azoles, including
voriconazole, itraconazole, and SCH 56592, for these isolates were
lower. C. dubliniensis was identified in 11 of 63 (17%)
serially evaluated patients. Variability in phenotypic characteristics dictates the use of molecular and biochemical techniques to identify C. dubliniensis. This study identifies C. dubliniensis in HIV-infected patients from San Antonio, Tex., and
shows that C. dubliniensis is frequently detected in those
patients by using a primary CHROMagar screen.
*
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: patterson{at}uthscsa.edu.
Journal of Clinical Microbiology, October 1998, p. 3007-3012, Vol. 36, No. 10
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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