Abstract:
:The rapid identification of pathogenic yeasts is a crucial step in ensuring that effective antifungal treatment is started as early as possible. CandiSelect 4 (CS4; Bio-Rad) is a new chromogenic medium for the isolation of fungi, the direct identification of Candida albicans and the presumptive identification of the major pathogenic Candida species. The performance of CS4 was compared with that of another chromogenic medium, CHROMagar Candida (CA; Becton Dickinson). For primary cultures, 502 of the 1549 (32 %) samples were culture-positive. A total of 542 yeasts were isolated including 465 monomicrobial and 37 mixed cultures: 392 C. albicans, 60 Candida glabrata, 25 Candida tropicalis, 12 Candida krusei and 53 other Candida species. The percentage of C. albicans isolates that could be identified directly after 24, 48 and 72 h culture was 31.6, 82.9 and 92.1 %, respectively, for CS4, and 32.9, 82.9 and 91.1 % for CA. The presumptive identification of C. glabrata, C. tropicalis and C. krusei was evaluated after 48 h incubation. The percentage of strains with morphologically typical colonies was 80, 68 and 84.6 %, respectively, for CS4 compared with 75, 76 and 76.9 % for CA. For pure subcultures, from 24 h, all isolates of C. albicans (n=21) were directly identifiable on the two chromogenic media CA and CS4. At 48 h, the proportion of typical strains observed on the two chromogenic media was identical for C. glabrata (85 %) and C. krusei (100 %). A slight difference in favour of CS4 was observed for C. tropicalis (100 vs 95 %). CS4 also allowed the growth of several other fungi. CS4 can be recommended as a primary isolation medium for the identification of C. albicans, and for the rapid and effective differentiation of the major pathogenic Candida species.
journal_name
J Med Microbioljournal_title
Journal of medical microbiologyauthors
Sendid B,François N,Standaert A,Dehecq E,Zerimech F,Camus D,Poulain Ddoi
10.1099/jmm.0.46715-0subject
Has Abstractpub_date
2007-04-01 00:00:00pages
495-499issue
Pt 4eissn
0022-2615issn
1473-5644journal_volume
56pub_type
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