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Evaluation of Candida colonization and use of the Candida Colonization Index in a paediatric Intensive Care Unit: a
Yasemin Ay Altintop1, Ayse Betul Ergul2, Ayse Nedret Koc3
1Department of Microbiology, Health Science University of Kayseri Training and Research Hospital, Kayseri, Turkey.
Abstract:
Invasive candidiasis is an important cause of morbidity and mortality, which primarily occurs in intensive care units. The Candida colonization index is an accepted score as an early warning tool for invasive candidiasis. This study was performed in a medical PICU with patients prone to contracting invasive candidiasis, to determine the usefulness of the Candida colonization index in forecasting invasive candidiasis in children. This prospective study including 87 patients (children 1 month to 16 years old with several illnesses and requiring ICU care) was conducted in a 22-bed medical PICU, Health Science University of Kayseri Training and Research Hospital, between January 2015 and September 2016. Those patients not on antifungal therapy, who were expected to stay more than seven days in PICU and had no history of a PICU stay within the previous two months were included in the study. In all patients, rectal, cervical, throat, axillary, perineal and nasal swab cultures, urine culture and blood culture tests were performed at admission and every week throughout their stay. Overall, 2639 swab and urine cultures (mean: 30.3) and 325 blood cultures (mean: 3.73) were obtained from 87 patients and a total of 576 grew Candida spp. In patients' swab and urine cultures C. albicans was detected in 64.5%, C. parapsilosis in 12.1%, C. glabrata in 7.5%, Saccharomyces spp in 3.0 %, C. tropicalis in 2.4%, C. krusei in 2.1% and C. kefyr in 1.2%. Three patients had C. albicans and one had C. parapsilosis growth in blood culture. Sensitivity, specificity, positive predictive value and negative predictive value for CI were found to be 33.73%, 100%, 6.7%, and 100%, respectively. Patients are at risk of fungal infection in paediatric intensive care units. Specificity and the negative predictive value of 100 % indicate that CI is a useful score to rule out the presence of invasive fungal disease. On the other hand, the low rate of sensitivity (33.3 %) and positive predictive value (6,7%) make this score less reliable in forecasting invasive candidiasis in children.
Insights
The Candida colonization index (CI) shows 100% specificity and negative predictive value, effectively ruling out invasive fungal disease in children. However, its low sensitivity and positive predictive value limit its reliability for forecasting candidiasis in pediatric intensive care units.
Area of Science:
- Medical Mycology
- Infectious Diseases
- Critical Care Medicine
Background:
- Invasive candidiasis is a significant cause of morbidity and mortality, particularly in intensive care units.
- The Candida colonization index (CI) is utilized as an early warning tool for invasive candidiasis.
Purpose of the Study:
- To evaluate the utility of the Candida colonization index (CI) in predicting invasive candidiasis in children.
- To assess the CI's forecasting capability in a medical pediatric intensive care unit (PICU) setting.
Main Methods:
- Prospective study of 87 pediatric patients (1 month to 16 years) in a medical PICU.
- Cultures (swab, urine, blood) performed weekly; CI calculated based on colonization.
- Inclusion criteria: no antifungal therapy, expected PICU stay >7 days, no recent PICU history.
Main Results:
- Candida spp. grew in 576 cultures; C. albicans was the most common isolate (64.5%).
- Invasive candidiasis occurred in 4 patients (3 C. albicans, 1 C. parapsilosis).
- CI demonstrated 100% specificity and 100% negative predictive value, but only 33.73% sensitivity and 6.7% positive predictive value.
Conclusions:
- The CI is valuable for ruling out invasive fungal disease in pediatric intensive care units due to its high specificity and negative predictive value.
- Low sensitivity and positive predictive value indicate the CI is less reliable for forecasting invasive candidiasis in this pediatric population.
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