Ten-year review of invasive Candida infections in a tertiary care center in Saudi Arabia

OBJECTIVES: To review the epidemiology of invasive Candida infections in a single center in Saudi Arabia over a subsequent 10-year period.

METHODS: This retrospective study was carried out in a single center in Saudi Arabia over a 10-year period. Records of all patients with invasive Candida infections (ICI) over the period from January 2003 to December 2012 were reviewed. Mann-Whitney U test was used for comparison of Candida albicans (C. albicans) versus non-albicans Candida species, and fluconazole resistance versus fluconazole susceptible in relation to crude mortality at 30 days and 90 days.

RESULTS: Eight hundred positive sterile site cultures, associated with 652 ICI were identified. Median age was 52 years and 53% of patients were males. Candida albicans were the most common species (38.7%), followed by Candida tropicalis (18.9%), and Candida glabrata (C. glabrata) (16.3%). The proportion of ICI caused by C. albicans remained stable over time (p=0.07), but C. glabrata increased significantly (p<0.001). The median rate of ICI per 1,000 hospital discharges per year was 1.65, with a significant trend towards higher rates over time (p=0.01). Most isolates were susceptible to fluconazole, voriconazole, and amphotericin B. Only 66.7% of Candida krusei were susceptible to caspofungin. Overall 30-day crude mortality was 40.6%. There was no significant difference in crude mortality in association with C. albicans compared with non-albicans species, nor in association with fluconazole resistance.

CONCLUSION: The rate of ICI increased significantly in the proportion of ICI caused by C. glabrata. Most isolates remain susceptible to caspofungin, voriconazole, and amphotericin B. The crude mortality remains high.