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San Miguel LG, Cobo J, Otheo E, Sánchez-Sousa A, Abraira V, Moreno S. Secular Trends of Candidemia in a Large Tertiary-Care Hospital From 1988 to 2000: Emergence ofCandida parapsilosis. Infect Control Hosp Epidemiol 2016; 26:548-52. [PMID: 16018430 DOI: 10.1086/502582] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractObjective:To analyze the secular trends of candidemia in a large tertiary-care hospital to determine the overall incidence, as well as the incidence by ward and by species, and to detect the occurrence of outbreaks.Design:Retrospective descriptive analysis. Secular trends were calculated using the Mantel-Haenszel test.Setting:A large tertiary-care referral center in Spain with a pediatric intensive care unit (ICU) to which more than 500 children with congenital cardiac disease are admitted annually.Patients:All patients with candidemia occurring from 1988 to 2000 were included. Cases were identified from laboratory records of blood cultures.Results:There were 331 episodes of candidemia. The overall incidence of nosocomial candidemia was 0.6 episode per 1,000 admissions and remained stable throughout the study period (P= .925). The species most frequently isolated wasCandida albicans, but the incidence ofC. parapsilosiscandidemia increased (P= .035). In the pediatric ICU, the incidence ofC. parapsilosiswas 5.6 episodes per 1,000 admissions and it was the predominant species. Outbreaks occurred occasionally in the pediatric ICU, suggesting nosocomial transmission.Conclusions:During this 13-year period, the incidence of candidemia remained stable in this hospital, butC. parapsilosisincreased in frequency. Occasional outbreaks of candidemia suggested nosocomial transmission ofCandidaspecies (Infect Control Hosp Epidemiol2005;26:548-552).
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Canadian clinical practice guidelines for invasive candidiasis in adults. CANADIAN JOURNAL OF INFECTIOUS DISEASES & MEDICAL MICROBIOLOGY 2012; 21:e122-50. [PMID: 22132006 DOI: 10.1155/2010/357076] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Candidemia and invasive candidiasis (C/IC) are life-threatening opportunistic infections that add excess morbidity, mortality and cost to the management of patients with a range of potentially curable underlying conditions. The Association of Medical Microbiology and Infectious Disease Canada developed evidence-based guidelines for the approach to the diagnosis and management of these infections in the ever-increasing population of at-risk adult patients in the health care system. Over the past few years, a new and broader understanding of the epidemiology and pathogenesis of C/IC has emerged and has been coupled with the availability of new antifungal agents and defined strategies for targeting groups at risk including, but not limited to, acute leukemia patients, hematopoietic stem cell transplants and solid organ transplants, and critical care unit patients. Accordingly, these guidelines have focused on patients at risk for C/IC, and on approaches of prevention, early therapy for suspected but unproven infection, and targeted therapy for probable and proven infection.
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Vaz C, Sampaio P, Clemons KV, Huang YC, Stevens DA, Pais C. Microsatellite multilocus genotyping clarifies the relationship of Candida parapsilosis strains involved in a neonatal intensive care unit outbreak. Diagn Microbiol Infect Dis 2011; 71:159-62. [PMID: 21840674 DOI: 10.1016/j.diagmicrobio.2011.05.014] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Accepted: 05/25/2011] [Indexed: 10/17/2022]
Abstract
Microsatellite typing of 25 Candida parapsilosis isolates from a described outbreak in a neonatal intensive care showed 2 large groups of blood isolates that were related to hand isolates from specific hospital staff, not infant-colonizing isolates. These results demonstrate the power of this typing tool in clarifying epidemiologic associations.
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Affiliation(s)
- Catarina Vaz
- CBMA-Centre of Molecular and Environmental Biology, Department of Biology, University of Minho, Braga 4710-057, Portugal
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Comparación entre métodos convencionales, ChromAgar Candida® y el método de la PCR para la identificación de especies de Candida en aislamientos clínicos. Rev Iberoam Micol 2011; 28:36-42. [DOI: 10.1016/j.riam.2010.11.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2010] [Revised: 11/09/2010] [Accepted: 11/18/2010] [Indexed: 11/19/2022] Open
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Paulo C, Mourão C, Veiga PM, Marques JM, Rocha G, Alves AF, Querol A, Meliço-Silvestre AA, Gonçalves I, Flores O, Clemente C, Gonçalves T. Retrospective analysis of clinical yeast isolates in a hospital in the centre of Portugal: spectrum and revision of the identification procedures. Med Mycol 2009; 47:836-44. [DOI: 10.3109/13693780802709081] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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6
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Vertical and horizontal transmission of Candida albicans in very low birth weight infants using DNA fingerprinting techniques. Pediatr Infect Dis J 2008; 27:231-5. [PMID: 18277930 DOI: 10.1097/inf.0b013e31815bb69d] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Very low birth weight infants (VLBW, < or = 1500 g) are at increased risk for invasive disease caused by fungi, and colonization is an important risk factor. This study was designed to examine the effect of maternal flora on Candida colonization of VLBW infants. METHODS Body site samples were collected within 24 hours of delivery from mothers who gave birth to VLBW infants, from their infants at birth, and then weekly for 12 weeks or until death or discharge. Yeast isolates were identified as Candida albicans by standard methods and typed by DNA fingerprinting using a C. albicans strain-specific DNA probe (CARE-2). RESULTS Sixty-six percent (50/76) of mothers were colonized with yeast and 51% (39/76) of their infants had a Candida species isolated at least once. Of 46 infants born to C. albicans-colonized mothers, 18 (39%) became colonized with C. albicans. Twenty-two percent (17/76) of the infants in the study were colonized with C. albicans by 1 week of age; 76% of these infants (13/17) were born to C. albicans-colonized mothers suggesting vertical transmission. DNA fingerprinting was performed on these 13 mother-infant pairs and 11 pairs demonstrated identical band patterns, confirming vertical transmission. However, of all infants colonized with C. albicans by the first week of age, just 65% (11/17) had a maternal source, and among all infants colonized at any time point, only 41% (11/27) became colonized by vertical transmission. CONCLUSIONS Both vertical and horizontal transmission contribute to Candida colonization of VLBW infants in the neonatal intensive care unit.
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Buzzini P, Turchetti B, Vaughan-Martini AE. The use of killer sensitivity patterns for biotyping yeast strains: the state of the art, potentialities and limitations. FEMS Yeast Res 2007; 7:749-60. [PMID: 17425671 DOI: 10.1111/j.1567-1364.2007.00238.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
In recent years molecular techniques have been the most useful tools for the unequivocal identification of undetermined strains at the species level. In many instances, however, a further discrimination at the strain level (biotyping) is required, such as during epidemiological investigations, in which the distribution of pathogenic microorganisms is studied, and for patent protection purposes. Although molecular methods are routinely used also for yeast biotyping, several nonmolecular techniques have been proposed. One of these, the determination of the killer sensitivity pattern (KSP) towards a panel of selected killer toxins has proven to be a good auxiliary method. Despite the plethora of studies published, the potential and limitations of the determination of KSPs have never been critically evaluated. In this review the use of this nonmolecular technique as a biotyping tool is discussed and compared with some currently used DNA-based procedures. In addition, methodological, mechanistic and ecological implications are evaluated.
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Affiliation(s)
- Pietro Buzzini
- Dipartimento di Biologia Vegetale e Biotecnologie Agroambientali, Sezione di Microbiologia Applicata, University of Perugia, Perugia, Italy.
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Srivastava S, Shetty N. Healthcare-associated infections in neonatal units: lessons from contrasting worlds. J Hosp Infect 2007; 65:292-306. [PMID: 17350726 PMCID: PMC7172768 DOI: 10.1016/j.jhin.2007.01.014] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2006] [Accepted: 01/18/2007] [Indexed: 11/20/2022]
Abstract
Neonatal intensive care units are vulnerable to outbreaks and sporadic incidents of healthcare-associated infections (HAIs). The incidence and outcome of these infections are determined by the degree of immaturity of the neonatal immune system, invasive procedures involved, the aetiological agent and its antimicrobial susceptibility pattern and, above all, infection control policies practised by the unit. It is important to raise awareness of infection control practices in resource-limited settings, since overdependence upon antimicrobial agents and co-existing lack of awareness of infection control is encouraging the emergence of multi-drug-resistant nosocomial pathogens. We reviewed 125 articles regarding HAIs from both advanced and resource-limited neonatal units in order to study risk factors, aetiological agents, antimicrobial susceptibility patterns and reported successes in infection control interventions. The articles include surveillance studies, outbreaks and sporadic incidents. Gram-positive cocci, viruses and fungi predominate in reports from the advanced units, while Gram-negative enteric rods, non-fermenters and fungi are commonly reported from resource-limited settings. Antimicrobial susceptibility patterns from surveillance studies determined the empirical therapy used in each neonatal unit. Most outbreaks, irrespective of the technical facilities available, were traced to specific lack of infection control practices. We discuss infection control interventions, with special emphasis on their applicability in resource-limited settings. Cost-effective measures for implementing these interventions, with particular reference to the recognition of the role of the microbiologist, the infection control team and antibiotic policies are presented.
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Affiliation(s)
- S Srivastava
- Department of Clinical Microbiology, Health Protection Agency Collaborating Centre, University College London Hospitals, London, UK
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García San Miguel L, Pla J, Cobo J, Navarro F, Sánchez-Sousa A, Alvarez ME, Martos I, Moreno S. Morphotypic and genotypic characterization of sequential Candida parapsilosis isolates from an outbreak in a pediatric intensive care unit. Diagn Microbiol Infect Dis 2004; 49:189-96. [PMID: 15246509 DOI: 10.1016/j.diagmicrobio.2004.03.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2004] [Accepted: 03/29/2004] [Indexed: 10/26/2022]
Abstract
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.
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Abstract
Infants in the neonatal intensive care unit (NICU) have many risk factors for infection. Compared with older children and adults, infants, particularly premature infants, are relatively immunocompromised. Patients in the NICU have intrinsic risk factors for infections due to immunological "deficiencies" or inadequate development of mechanical barriers such as skin and gastrointestinal tract mucosa. Like other ICU populations, NICU patients have extrinsic risk factors for infection such as prolonged hospitalization, invasive procedures, instrumentation, medical treatments and concomitant medical conditions. Compared with healthy full-term infants, patients in the NICU develop abnormal flora, which is generally acquired in the NICU from patient-to-patient transmission via hand carriage of healthcare workers. This flora is frequently multidrug-resistant as it has developed under the selective pressure of antibiotics and can cause invasive disease. An understanding of the risk factors that are associated with hospital-acquired infections is essential to design preventive strategies.
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Affiliation(s)
- Lisa Saiman
- Division of Infectious Diseases, Department of Pediatrics, Columbia University, New York, NY 10032, USA.
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Fanello S, Delbos V, Bouchara J, Jousset N, Le Flohic A. Acquisition nosocomiale des infections à levures en gériatrie : apport de l’analyse génotypique d’isolats de Candida albicans. Med Mal Infect 2002. [DOI: 10.1016/s0399-077x(02)00402-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Endocarditis is an uncommon complication of invasive candidiasis. We present a fatal case of endocarditis caused by Candida albicans in a very low birth weight infant. The 780-g male infant did not have any structural heart disease and a central venous catheter was not placed. Endocarditis developed in spite of parenteral fluconazole treatment. Echocardiography was a valuable tool in making the diagnosis. The infant died on the 40th day of life. The development of Candida endocarditis in a premature infant who was treated with fluconazole had not been previously reported. In the case of systemic candidiasis, premature infants require very careful monitoring for the progression of the disease, even if antifungal therapy is administered.
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Affiliation(s)
- G Mogyorósy
- Department of Pediatrics, University of Debrecen, Debrecen, Hungary.
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Fanello S, Bouchara JP, Jousset N, Delbos V, LeFlohic AM. Nosocomial Candida albicans acquisition in a geriatric unit: epidemiology and evidence for person-to-person transmission. J Hosp Infect 2001; 47:46-52. [PMID: 11161898 DOI: 10.1053/jhin.2000.0849] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
This prospective study, which included 69 patients over a two-month period, was conducted to evaluate the incidence of community-acquired carriage and hospital-acquired yeasts in elderly patients hospitalized in a short stay care unit. Furthermore, possible person-to-person transmission was investigated by means of genotyping the Candida albicans isolates obtained from samples (throat swabs, urine and stools) systematically taken from the patients at different times during the hospitalization and from healthcare workers (throat swabs and handwashes) in the middle of the observation period. This study showed a high prevalence rate of 64% for community-acquired yeast carriage and a 40% incidence rate for hospital- acquired yeasts. Mycological analysis of the samples from the healthcare workers revealed eight of them to be colonized in the oral cavity. In addition, pulsed field gel electrophoresis and mitochondrial DNA analysis of the C. albicans isolates demonstrated person-to-person transmission. This study suggests that regular mycological sampling should be done as hospitalized elderly patients are frequently colonized by yeasts. Likewise, oropharyngeal swabs from healthcare workers may be helpful in this setting.
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Affiliation(s)
- S Fanello
- Département de Santé Publique, UFR Médecine, Angers, France
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15
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Abstract
DNA fingerprinting methods have evolved as major tools in fungal epidemiology. However, no single method has emerged as the method of choice, and some methods perform better than others at different levels of resolution. In this review, requirements for an effective DNA fingerprinting method are proposed and procedures are described for testing the efficacy of a method. In light of the proposed requirements, the most common methods now being used to DNA fingerprint the infectious fungi are described and assessed. These methods include restriction fragment length polymorphisms (RFLP), RFLP with hybridization probes, randomly amplified polymorphic DNA and other PCR-based methods, electrophoretic karyotyping, and sequencing-based methods. Procedures for computing similarity coefficients, generating phylogenetic trees, and testing the stability of clusters are then described. To facilitate the analysis of DNA fingerprinting data, computer-assisted methods are described. Finally, the problems inherent in the collection of test and control isolates are considered, and DNA fingerprinting studies of strain maintenance during persistent or recurrent infections, microevolution in infecting strains, and the origin of nosocomial infections are assessed in light of the preceding discussion of the ins and outs of DNA fingerprinting. The intent of this review is to generate an awareness of the need to verify the efficacy of each DNA fingerprinting method for the level of genetic relatedness necessary to answer the epidemiological question posed, to use quantitative methods to analyze DNA fingerprint data, to use computer-assisted DNA fingerprint analysis systems to analyze data, and to file data in a form that can be used in the future for retrospective and comparative studies.
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Saiman L, Ludington E, Pfaller M, Rangel-Frausto S, Wiblin RT, Dawson J, Blumberg HM, Patterson JE, Rinaldi M, Edwards JE, Wenzel RP, Jarvis W. Risk factors for candidemia in Neonatal Intensive Care Unit patients. The National Epidemiology of Mycosis Survey study group. Pediatr Infect Dis J 2000; 19:319-24. [PMID: 10783022 DOI: 10.1097/00006454-200004000-00011] [Citation(s) in RCA: 415] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
BACKGROUND Candida species are important nosocomial pathogens in neonatal intensive care unit (NICU) patients. METHODS A prospective cohort study was performed in six geographically diverse NICUs from 1993 to 1995 to determine the incidence of and risk factors for candidemia, including the role of gastrointestinal (GI) tract colonization. Study procedures included rectal swabs to detect fungal colonization and active surveillance to identify risk factors for candidemia. Candida strains obtained from the GI tract and blood were analyzed by pulsed field gel electrophoresis to determine whether colonizing strains caused candidemia. RESULTS In all, 2,847 infants were enrolled and 35 (1.2%) developed candidemia (12.3 cases per 1,000 patient discharges or 0.63 case per 1,000 catheter days) including 23 of 421 (5.5%) babies < or =1,000 g. After adjusting for birth weight and abdominal surgery, forward multivariate logistic regression analysis demonstrated significant risk factors, including gestational age <32 weeks, 5-min Apgar <5; shock, disseminated intravascular coagulopathy, prior use of intralipid, parenteral nutrition, central venous catheters, H2 blockers, intubation or length of stay > 7 days before candidemia (P < 0.05). Catheters, steroids and GI tract colonization were not independent risk factors, but GI tract colonization preceded candidemia in 15 of 35 (43%) case patients. CONCLUSIONS Candida spp. are an important cause of late onset sepsis in NICU patients. The incidence of candidemia might be decreased by the judicious use of treatments identified as risk factors and avoiding H2 blockers.
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Affiliation(s)
- L Saiman
- Department of Pediatrics, Columbia University, New York, NY 10032, USA.
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17
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Abstract
DNA fingerprinting methods have evolved as major tools in fungal epidemiology. However, no single method has emerged as the method of choice, and some methods perform better than others at different levels of resolution. In this review, requirements for an effective DNA fingerprinting method are proposed and procedures are described for testing the efficacy of a method. In light of the proposed requirements, the most common methods now being used to DNA fingerprint the infectious fungi are described and assessed. These methods include restriction fragment length polymorphisms (RFLP), RFLP with hybridization probes, randomly amplified polymorphic DNA and other PCR-based methods, electrophoretic karyotyping, and sequencing-based methods. Procedures for computing similarity coefficients, generating phylogenetic trees, and testing the stability of clusters are then described. To facilitate the analysis of DNA fingerprinting data, computer-assisted methods are described. Finally, the problems inherent in the collection of test and control isolates are considered, and DNA fingerprinting studies of strain maintenance during persistent or recurrent infections, microevolution in infecting strains, and the origin of nosocomial infections are assessed in light of the preceding discussion of the ins and outs of DNA fingerprinting. The intent of this review is to generate an awareness of the need to verify the efficacy of each DNA fingerprinting method for the level of genetic relatedness necessary to answer the epidemiological question posed, to use quantitative methods to analyze DNA fingerprint data, to use computer-assisted DNA fingerprint analysis systems to analyze data, and to file data in a form that can be used in the future for retrospective and comparative studies.
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Affiliation(s)
- D R Soll
- Department of Biological Sciences, University of Iowa, Iowa City, IA 52242, USA.
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Arnavielhe S, Blancard A, Mallie M, Bastide JM. Case report of three Candida albicans infections detected at delivery. J Infect 2000; 40:88-90. [PMID: 10762118 DOI: 10.1053/jinf.1999.0580] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We report three similar cases of Candida albicans infections in neonates, at delivery. A retrospective study of the isolates was conducted to define the diversity of infective strains and their susceptibility to amphotericin B and fluconazole. Three neonates with fever, 'not doing well' at delivery had positive cultures for C. albicans. Samples were then taken from the mothers who did not exhibit any clinical symptoms of infection. Candida albicans strains isolated from both neonates and mothers were cultured, six colonies of each were typed by multilocus enzyme electrophoresis. The E-test method was used to determine the susceptibility of each colony to the two antifungals commonly used in this unit: amphotericin B and fluconazole. The initial isolates were composed of different types of strains. In the three cases, one of the mother types was found in the neonate isolates, leading us to suggest a vertical transmission of strains. All of the other types were distinct. All of the types were susceptible to amphotericin B, although three of them, one type isolated from a neonate and two types isolated from the mother, were resistant to fluconazole. The diversity of infective strains remains alarming and encourages the consideration of several colonies per isolate or several isolates, when it is possible, per infection case. This study also points out the need to survey the susceptibility of infective strains, since some of them appear soon to be resistant to fluconazole.
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Affiliation(s)
- S Arnavielhe
- Laboratoire d'Immunologie-Parastologie, Faculté de Pharmacie, Montpellier, France
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Abstract
Despite adequate treatment, nosocomial fungal infections have become an increasingly important cause of morbidity, extended hospitalization, and mortality in critically ill newborn babies. Furthermore, the high incidence of central nervous system involvement in septic newborns frequently results in serious neurological damage and psychomotorial sequelae. The prevention of fungal colonization in the population at risk, together with prompt diagnosis and treatment, are an efficient combination which lead to a better outcome of neonatal fungal infections. New drugs characterized by great efficacy and tolerance have recently been employed in clinical practice. This article summarizes certain aspects of Candida spp. infections in the neonatal period with regard to multisystemic presentation and involvement.
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Affiliation(s)
- B J Khoory
- Department of Pediatrics, University of Verona, Italy
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20
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Abstract
Candida species are frequently encountered as part of the human commensal flora. Colonization mostly precedes candidemia and is an independent risk factor for the development of candidemia. Genotyping methods showed the similarity between colonizing and infecting strains, thus making endogenous origin likely, though exogenous sources like total parenteral nutrition also have been described. Health care workers (HCWs) play an important role in the transmission of yeasts. Candida species are frequently isolated from the hands of HCWs and can be transmitted from hands to patients. Granulocytopenia and damage of the mucosal lining resulting from intensive chemotherapy due to cancer, the increasing use of broad spectrum antibiotics, and the use of intravenous catheters are other important risk factors for the development of candidemia. Candidemia is associated with a high mortality and prolonged hospitalization. Therefore, and because of the high frequency of dissemination, all candidemias should be treated. Amphotericin B was considered the standard drug for the systemic treatment of candidemia. Fluconazole has been shown to be an effective and safe alternative in non-neutropenic patients. 5-Fluorocytosine has been used in combination with amphotericin B in the treatment of deep-seated infections. Liposomal formulations of amphotericin B and other new antifungal drugs currently are under investigation. C. albicans is the most frequently isolated Candida species, although the proportion of infections caused by non-C. albicans species is increasing. Also, there are reports of development of resistance to amphotericin B. C. lusitaniae is known for primary resistance and the development of resistance to amphotericin B. Development of resistance to fluconazole is mainly seen in AIDS patients with recurrent oropharyngeal candidiasis who receive longer courses of therapy.
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Affiliation(s)
- F M Verduyn Lunel
- Department of Medical Microbiology, University Hospital Nijmegen, The Netherlands
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Huang YC, Lin TY, Leu HS, Peng HL, Wu JH, Chang HY. Outbreak of Candida parapsilosis fungemia in neonatal intensive care units: clinical implications and genotyping analysis. Infection 1999; 27:97-102. [PMID: 10219638 DOI: 10.1007/bf02560505] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
During a 5-month period, 17 infants hospitalized in neonatal intensive care units of a medical center and a branch hospital developed 18 episodes of Candida parapsilosis fungemia. The mean age at onset was 35 days. Prior to fungemia, all the infants had received hyperalimentation and antibiotics, and 15 infants had had central venous catheters. The presenting symptoms were variable but only vague in 40% of the episodes. Despite administration of antifungal agents, subsequent eradication of fungemia was achieved in only two-thirds of the episodes. None of the environmental samples was positive for C. parapsilosis, while 20% of hand-washing samples of staff working in both units yielded this microorganism. Four genotypes with two main types were identified from 14 outbreak strains and eight genotypes from 14 hand-washing strains, with one type predominant. The results suggest that C. parapsilosis fungemia increases the morbidity and mortality of neonates but does not cause acute lethal events. The outbreak was caused by two main genotypes, possibly via cross-infection by the hands of health care workers.
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Affiliation(s)
- Y C Huang
- Div. of Infectious Diseases, Chang Gung Children's Hospital
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Riederer K, Fozo P, Khatib R. Typing of Candida albicans and Candida parapsilosis: species-related limitations of electrophoretic karyotyping and restriction endonuclease analysis of genomic DNA. Mycoses 1998; 41:397-402. [PMID: 9916463 DOI: 10.1111/j.1439-0507.1998.tb00360.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Species-related discrimination limits of electrophoretic karyotyping (EK) and restriction endonuclease analysis of genomic DNA (REAG), using pulse-field gel electrophoresis, in typing Candida albicans (CA) and Candida parapsilosis (CP) were compared. Eleven CA and 12 CP isolates from individual neonates and three CA and three CP control isolates were used. For CA, EK and REAG with sfiI displayed seven and six banding-patterns, respectively. One karyotype and two SfiI banding-patterns were observed among the control-isolates. Combining EK/REAG (SfiI) demonstrated nine composites and three distinct control-composites. For CP, EK displayed nine karyotypes, REAG (SfiI) demonstrated four banding-patterns, and REAG (BssHII) yielded six banding-patterns. EK and REAG/SfiI failed to distinguish any CP-controls whereas REAG/BssHII distinguished 2/3 CP-controls. Combining EK/REAG (SfiI) showed 10 composites indistinguishable from CP-controls whereas EK/REAG (BssHII) demonstrated 11 composites and three distinct control-composites. These results illustrate that singly, EK and REAG have significant limitation in typing Candida species though EK is more precise. Combining both methods yields better results but the appropriate restriction endonuclease may vary by strains or species. These findings underscore the importance of combining multiple typing methods, testing several control isolates, and correlating the results with careful epidemiological assessment.
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Affiliation(s)
- K Riederer
- St John Hospital and Medical Center, Detroit, MI 48236, USA
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Huang YC, Lin TY, Peng HL, Wu JH, Chang HY, Leu HS. Outbreak of Candida albicans fungaemia in a neonatal intensive care unit. SCANDINAVIAN JOURNAL OF INFECTIOUS DISEASES 1998; 30:137-42. [PMID: 9730299 DOI: 10.1080/003655498750003519] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
During a 4-month period, 9 premature infants hospitalized in a neonatal intensive care unit (NICU) developed Candida albicans fungaemia. All 9 infants received antifungal agents. Fluconazole was administered in 7 patients and successfully eradicated this organism in 6 with no adverse effects. For epidemiological investigation, 64 environmental specimens and hand-washings of all 54 staff members involved in the NICU were examined for the presence of this organism. No C. albicans could be identified from environmental sources, while the hand-washing of 1 nurse was C. albicans-positive. Two genotyping methods, including electrophoretic karyotyping using contour-clamped homogeneous electric field gel electrophoresis and polymerase chain reaction-based direct sequencing of rRNA gene, were used in the analysis of the isolates recovered from blood cultures of the infants, the hand-washing of the nurse and 7 control isolates. Both methods yielded comparable results and revealed that all 13 isolates from infected infants as well as the isolate from hand washing of the nurse were of the same genotype while the control isolates were distinct. These results suggest that the outbreak of C. albicans fungaemia was caused by a particular strain and possibly via cross-infection. In addition, we showed that fluconazole seemed to be safe and effective in treating C. albicans fungaemia in neonates, although the data were limited.
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Affiliation(s)
- Y C Huang
- Division of Infectious Diseases, Chang Gung Childrens Hospital, Taoyuan, Taiwan, ROC
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Hedderwick SA, Wan JY, Bradley SF, Sangeorzan JA, Terpenning MS, Kauffman CA. Risk factors for colonization with yeast species in a Veterans Affairs long-term care facility. J Am Geriatr Soc 1998; 46:849-53. [PMID: 9670871 DOI: 10.1111/j.1532-5415.1998.tb02718.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To assess colonization and serious infection with yeasts and the risk factors that are associated with colonization by these organisms. DESIGN Monthly surveillance for colonization and infection over a period of 2 years. SETTING A long-term-care facility (LTCF) attached to an acute-care Veterans Affairs Medical Center. PARTICIPANTS The 543 men and 10 women in the facility. MEASUREMENTS Colonization and serious infection rates with yeasts. Analysis of risk factors associated with yeast colonization of residents. RESULTS Colonization rates were relatively stable during the 2-year period (53+/-1.8% patients colonized per month). Candida albicans was the most common colonizer, found in 35+/-.9% of patients colonized per month. The pharynx was the most commonly colonized site, with 41+/-1.4% of patients per month with pharyngeal colonization. Eighty-four percent of patients remaining in the facility for 3 or more months were colonized by yeast at some time during their stay. Presence of neurogenic bladder, leg amputation, or a low serum albumin were independently associated with yeast colonization; neither diabetes mellitus nor functional status was a risk factor for colonization by yeasts. Only four serious yeast infections in four patients (esophagitis and three urinary tract infections) were found during the 2-year period; all infections occurred in patients who were colonized by yeasts previously. CONCLUSION In our LTCF, colonization of patients by yeasts occurred commonly in those residents remaining in the facility for 3 or more months. However, serious yeast infections occurred infrequently. It is likely that colonization of residents of LTCFs by yeasts may only become clinically important when the patient is transferred to an acute-care hospital where additional risk factors may allow the development of serious yeast infection.
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Affiliation(s)
- S A Hedderwick
- Department of Veterans Affairs Medical Center, University of Michigan Medical School, Ann Arbor 48105, USA
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Reef SE, Lasker BA, Butcher DS, McNeil MM, Pruitt R, Keyserling H, Jarvis WR. Nonperinatal nosocomial transmission of Candida albicans in a neonatal intensive care unit: prospective study. J Clin Microbiol 1998; 36:1255-9. [PMID: 9574687 PMCID: PMC104810 DOI: 10.1128/jcm.36.5.1255-1259.1998] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Nosocomial Candida albicans infections have become a major cause of morbidity and mortality in neonates in neonatal intensive care units (NICUs). To determine the possible modes of acquisition of C. albicans in hospitalized neonates, we conducted a prospective study at Grady Memorial Hospital, Atlanta, Ga. Clinical samples for fungal surveillance cultures were obtained at birth from infants (mouth, umbilicus, and groin) and their mothers (mouth and vagina) and were obtained from infants weekly until they were discharged. All infants were culture negative for C. albicans at birth. Six infants acquired C. albicans during their NICU stay. Thirty-four (53%) of 64 mothers were C. albicans positive (positive at the mouth, n = 26; positive at the vagina, n = 18; positive at both sites, n = 10) at the time of the infant's delivery. A total of 49 C. albicans isolates were analyzed by restriction endonuclease analysis and restriction fragment length polymorphism analysis by using genomic blots hybridized with the CARE-2 probe. Of the mothers positive for C. albicans, 3 of 10 were colonized with identical strains at two different body sites, whereas 7 of 10 harbored nonidentical strains at the two different body sites. Four of six infants who acquired C. albicans colonization in the NICU had C. albicans-positive mothers; specimens from all mother-infant pairs had different restriction endonuclease and CARE-2 hybridization profiles. One C. albicans-colonized infant developed candidemia; the colonizing and infecting strains had identical banding patterns. Our study indicates that nonperinatal nosocomial transmission of C. albicans is the predominant mode of acquisition by neonates in NICUs at this hospital; mothers may be colonized with multiple strains of C. albicans simultaneously; colonizing C. albicans strains can cause invasive disease in neonates; and molecular biology-based techniques are necessary to determine the epidemiologic relatedness of maternal and infant C. albicans isolates and to facilitate determination of the mode of transmission.
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Affiliation(s)
- S E Reef
- Division of Bacterial and Mycotic Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333, USA
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26
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Huang YC, Lin TY, Leu HS, Wu JL, Wu JH. Yeast carriage on hands of hospital personnel working in intensive care units. J Hosp Infect 1998; 39:47-51. [PMID: 9617684 DOI: 10.1016/s0195-6701(98)90242-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The frequency and distribution of yeast carriage on the hands of hospital personnel working in intensive care unit (ICUs), was investigated. Hand carriage of yeast and Candida species was 46 and 29%, respectively. Rhodotorula sp. and Candida parapsilosis were most frequently recovered. There was no significant difference in frequency or distribution of yeasts and Candida sp. recovered among the three ICUs. Seventeen C. parapsilosis isolates and three Candida albicans isolates were genotyped by electrophoretic karyotyping using contour-clamped homogenous electric-field gel electrophoresis. Eleven separate types of C. parapsilosis and two types of C. albicans were identified. There was no common genotype among these isolates, even within the same unit. We conclude that yeast carriage on the hands of personnel working in ICU is common, but these yeasts are usually not acquired from a common source in the ICU.
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Affiliation(s)
- Y C Huang
- Department of Medicine, Chang Gung Children's Hospital, Kweishan, Taoyuan, Taiwan
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Khatib R, Thirumoorthi MC, Riederer KM, Sturm L, Oney LA, Baran J. Clustering of Candida infections in the neonatal intensive care unit: concurrent emergence of multiple strains simulating intermittent outbreaks. Pediatr Infect Dis J 1998; 17:130-4. [PMID: 9493809 DOI: 10.1097/00006454-199802000-00010] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Clusters of Candida albicans and Candida parapsilosis infections were noted intermittently in our neonatal intensive care unit (NICU). We attempted to determine whether these clusters represented single strain outbreaks or coincidental emergence of unrelated strains. METHODS A retrospective examination of the frequency of candidemia during a 9-year period, two point prevalence studies of colonization and assessment of strain relatedness of individual infant isolates during and in between clusters during a 2-year period with karyotyping and restriction endonuclease analysis of genomic DNA (REAG). RESULTS C. albicans and C. parapsilosis infections emerged in a scattered pattern (1 to 2 cases every few months) with intermittent clustering of 3 cases/month. The colonization rate was 50% 5 weeks after an apparent cluster, equally distributed between C. albicans and C. parapsilosis, and 17.6% (exclusively with C. parapsilosis) 4 months after absence of invasive disease. Utilizing REAG or karyotyping singly we noted 12 and 16 DNA banding patterns, respectively, among 23 infant isolates. Few patterns were observed repeatedly over 2- to 20-month periods, implying recurrent emergence of the same strains. Combining karyotyping with REAG revealed a different epidemiologic pattern. It identified 20 distinct composites with identical composites in 3 infant pairs. All infants with identical composites were in the NICU concurrently. The frequency of strain relatedness was comparable among clustered cases (16.7%), scattered cases (7.7%) and simultaneously colonized infants (16.7%). CONCLUSIONS These findings illustrate that Candida infections clustered periodically in our NICU but that these clusters were often caused by unrelated strains with infrequent cross-infection during and between clusters. With suboptimal typing this pattern of emergence can be mistaken for same strain outbreaks.
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Affiliation(s)
- R Khatib
- St. John Hospital, Detroit, MI 48236, USA
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28
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Del Castillo L, Bikandi J, Nieto A, Quindós G, Sentandreu R, Pontón J. Comparison of morphotypic and genotypic methods for strain delineation in Candida. Mycoses 1997; 40:445-50. [PMID: 9470410 DOI: 10.1111/j.1439-0507.1997.tb00182.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We compared two phenotypic methods, colony morphotyping on Sabouraudtripheniltetrazolium agar (STTZ) and serotyping, with two genotypic methods, karyotyping and Random Amplified Polymorphic DNA bands obtained by PCR amplification (RAPD-PCR), for strain delineation in 33 Candida clinical isolates and two C. albicans strains from culture collections. Analysis of isolates on STTZ showed 11 different morphotypes. In two patients there was a switch in the morphotype coincidential with a change in the susceptibility of the isolates to azole antifungals. C. albicans isolates were divided into two serotypes. Sixteen and 18 different patterns were identified among the Candida isolates by karyotyping and RAPD-PCR, respectively. No relationship was found between any of the typing methods used and the source of the isolates. The combination of karyotyping and morphotyping on STTZ yielded useful epidemiological information, since it allowed the differentiation among the Candida species studied and the discrimination of clusters within C. albicans as well as to check the capacity of a strain to generate variants with different susceptibility to some antifungals.
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Affiliation(s)
- L Del Castillo
- Secció Departamental de Microbiología, Facultat de Farmacía, Universitat de València, Spain
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29
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Arnavielhe S, Blancard A, Mallié M, Quilici M, Bastide JM. Multilocus enzyme electrophoresis analysis of Candida albicans isolates from three intensive care units. An epidemiological study. Mycoses 1997; 40:159-67. [PMID: 9476482 DOI: 10.1111/j.1439-0507.1997.tb00208.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
To evaluate the mechanism and risk factor associated with the nosocomial acquisition of Candida albicans, a 3-month prospective study was conducted on non-neutropenic patients in three distinct intensive care units in distinct hospitals. A total of 43 samples from 19 patients has been typed by multilocus enzyme electrophoresis (MEE). Samples (24) from the deep pharynx of hospital staff members were also cultured and typed. Thirteen of the 19 enzyme loci studied were polymorphic. The 52 electrophoretic types were assigned to 67 isolates, each type was represented by one to five isolates; this proved the great diversity of the isolates. It appeared that most patients were colonized or infected with different C. albicans strains. This study pointed out a possible cross-infection between patients and hospital staff and between healthy members of the hospital staff, and also showed the successive stages of infection by different electrophoretic types. Intubation and respiratory equipment as surgery intervention were possible sources of observed infections.
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Affiliation(s)
- S Arnavielhe
- Laboratoire d'Immunologie et Parasitologie, Faculté de Pharmacie, Montpellier, France
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30
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Abstract
The killer phenomenon in yeasts has been revealed to be a multicentric model for molecular biologists, virologists, phytopathologists, epidemiologists, industrial and medical microbiologists, mycologists, and pharmacologists. The surprisingly widespread occurrence of the killer phenomenon among taxonomically unrelated microorganisms, including prokaryotic and eukaryotic pathogens, has engendered a new interest in its biological significance as well as its theoretical and practical applications. The search for therapeutic opportunities by using yeast killer systems has conceptually opened new avenues for the prevention and control of life-threatening fungal diseases through the idiotypic network that is apparently exploited by the immune system in the course of natural infections. In this review, the biology, ecology, epidemiology, therapeutics, serology, and idiotypy of yeast killer systems are discussed.
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Affiliation(s)
- W Magliani
- Istituto di Microbiologia, Facoltà di Medicina e Chirurgia, Università degli Studi di Parma, Italy
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31
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Quindós G, Lipperheide V, Barturen B, Alonso R, Bikandi J, San Millán R, Tellaetxe M, Ribacoba L, Pontón J. A new method of antibiotyping yeasts for subspecies discrimination and distribution in human clinical specimens. Eur J Epidemiol 1996; 12:55-62. [PMID: 8817179 DOI: 10.1007/bf00144429] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A study of the antibiotypes of 764 isolates of the genera Candida and Torulopsis from different clinical specimens is reported. The typing method was based on the susceptibility results obtained by the standardized and partially automated kit ATB-Fungus (API-bioMérieux), giving to each strain a code of six figures, according to these criteria: susceptibility to 5-fluorocytosine, amphotericin B, nystatin, miconazole, econazole, and ketoconazole. Candida albicans serotypes were determined by the Candida Check test (Iatron, Japan). Twenty-six antibiotypes were found in C. albicans (482 isolates), 21 types in serotype A, and 15 in serotype B strains. Candida parapsilosis (115 isolates) was divided into 11 antibiotypes, Torulopsis glabrata (53 isolates) into five, Candida guilliermondii (36 isolates) into 10 and Candida tropicalis (31 isolates) into eight. Depending on the sample origin, 000000 (susceptibility to all the antifungals tested) was the predominant C. albicans antibiotype (92.9% of blood isolates, 41.2% of vaginal isolates, 33.3% of respiratory isolates, isolates, 31.01% or oral and digestive tract isolates, and 25.0% of nail and skin isolates). No predominant antibiotypes were found in strains from respiratory tract, skin ad nails. A reproducibility close to 99% was found with the test. Simplicity and standardization could make this method useful for typing Candida and Torulopsis isolates.
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Affiliation(s)
- G Quindós
- Departamento de Inmunología, Microbiología y Parasitología, Facultad de Medicina y Odontología, Universidad del País Vasco, Bilbao, Spain
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32
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Bastide JM. [Candida infections: new epidemiologic markers]. Rev Med Interne 1996; 17 Suppl 3:346s-348s. [PMID: 9008742 DOI: 10.1016/s0248-8663(97)80875-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- J M Bastide
- UPRES 696, laboratorie d'immunologie et parasitologie, Montpellier, France
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O'Connell B, Coleman DC, Bennett D, Sullivan D, McCann SR, Keane CT. An epidemiological study of Candida species infection in cancer patients using genetic fingerprinting and morphotyping. J Hosp Infect 1995; 31:211-7. [PMID: 8586790 DOI: 10.1016/0195-6701(95)90068-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
During a six-week period a cluster of four cases of Candida fungaemia occurred in a mixed haematology/oncology unit of a large Dublin teaching hospital. A study was conducted to determine whether the cluster of cases was caused by a particular strain. Nine patients were studied; five who were colonized with Candida spp. and four who developed Candida fungaemia. Twenty-two clinical isolates of Candida spp. were collected and identified. Three of the patients with fungaemia yielded Candida albicans from blood cultures and C. tropicalis was isolated from the fourth patient. C. albicans isolates were serotyped, morphotyped and analysed by DNA fingerprinting of total cellular DNA using the cloned C. albicans-specific, mid-repeat sequence element 27A as a molecular probe. All C. albicans isolates were of serotype A. Eight distinguishable types were identified by both morphotyping and DNA typing from 19 C. albicans isolates recovered from seven individual patients, although there were several discrepancies. Of three patients from whom two or more isolates of C. albicans were recovered on separate occasions, two yielded recurrent isolates with different morphotype codes. However, in both cases, the recurrent isolates from individual patients yielded indistinguishable, or closely related, DNA fingerprint profiles. Both morphotyping and DNA fingerprint analysis readily distinguished the three blood culture isolates of C. albicans. We conclude that the Candida spp. infections in the unit were not due to cross-infection and were probably related to the patients' indigenous flora.
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Affiliation(s)
- B O'Connell
- Department of Clinical Microbiology, St. James's Hospital, Dublin, Republic of Ireland
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