Morphotypic and genotypic characterization of sequential Candida parapsilosis isolates from an outbreak in a pediatric intensive care unit

Candidemia outbreaks that due to cross-infection are an emerging problem in hospitals. Typing of microorganisms is an essential tool for understanding the epidemiologic aspects of the infection. Techniques based on phenotypic characteristics are inexpensive and easy to perform but are limited by the...

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Bibliographic Details
Published in:Diagnostic microbiology and infectious disease 2004-07, Vol.49 (3), p.189-196
Main Authors: García San Miguel, Lucía, Pla, Jesús, Cobo, Javier, Navarro, Federico, Sánchez-Sousa, Aurora, Alvarez, Maria Elena, Martos, Isabel, Moreno, Santiago
Format: Article
Language:English
Subjects:
Base Sequence
Biological and medical sciences
Candida - classification
Candida - genetics
Candida parapsilosis
Candidiasis - diagnosis
Candidiasis - epidemiology
Case-Control Studies
Disease Outbreaks
DNA, Fungal - analysis
Female
Fundamental and applied biological sciences. Psychology
Fungemia - diagnosis
Fungemia - epidemiology
Genotype
Humans
Infant
Infant, Newborn
Infectious diseases
Intensive Care Units, Pediatric
Male
Medical sciences
Microbiology
Miscellaneous
Molecular Sequence Data
Mycological Typing Techniques
Mycology
Phenotype
Polymerase Chain Reaction - methods
Reference Values
Sensitivity and Specificity
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Summary:Candidemia outbreaks that due to cross-infection are an emerging problem in hospitals. Typing of microorganisms is an essential tool for understanding the epidemiologic aspects of the infection. Techniques based on phenotypic characteristics are inexpensive and easy to perform but are limited by their lack of reproducibility. This study assessed the value of several phenotypic and genotypic techniques that are used in epidemiologic investigations of Candida parapsilosis in clinical practice and used a combination of these methods to analyze outbreak of C. parapsilosis candidemia. Random amplification of polymorphic DNA polymerase chain reaction with several primers was unsatisfactory because it lacked discriminatory power. By simplifying the reading of the morphotypes, we increased their reproducibility for each malt agar and 2,3,5-triphenyltetrazolium media (97% and 90%) and thus their suitability for its use. The combination of electrophoretic karyotype and the simplified morphotypes was rapid and practical to characterize the different clusters involved in the intensive care unit outbreak.
ISSN:0732-8893
1879-0070
DOI:10.1016/j.diagmicrobio.2004.03.017