Abstract:
:The aim of this study was to investigate oral yeast colonization and oral yeast strain diversity in irradiated (head and neck), dentate, xerostomic individuals. Subjects were recruited from a nasopharyngeal carcinoma clinic and were segregated into group A (age, <60 years [n = 25; average age +/- standard deviation (SD), 48 +/- 6 years; average postirradiation time +/- SD, 5 +/- 5 years]) and group B (age, >/=60 years [n = 8; average age +/- SD, 67 +/- 4 years; average postirradiation time +/- SD, 2 +/- 2 years]) and were compared with age- and sex-matched healthy individuals in group C (age, <60 years [n = 20; average age +/- SD, 44 +/- 12 years] and group D (age, >/=60 years [n = 10; average age, 70 +/- 3 years]). Selective culture of oral rinse samples was carried out to isolate, quantify, and speciate yeast recovery. All test subjects underwent a 3-month comprehensive oral and preventive care regimen plus topical antifungal therapy, if indicated. A total of 12 subjects from group A and 5 subjects from group B were recalled for reassessment of yeast colonization. Sequential (pre- and posttherapy) Candida isolate pairs from patients were phenotypically (all isolate pairs; biotyping and resistotyping profiles) and genotypically (Candida albicans isolate pairs only; electrophoretic karyotyping by pulsed-field gel electrophoresis, restriction fragment length polymorphism [RFLP], and randomly amplified polymorphic DNA [RAPD] assays) evaluated. All isolates were Candida species. Irradiated individuals were found to have a significantly increased yeast carriage compared with the controls. The isolation rate of Candida posttherapy remained unchanged. A total of 9 of the 12 subjects in group A and 3 of the 5 subjects in group B harbored the same C. albicans or Candida tropicalis phenotype at recall. Varying degrees of congruence in the molecular profiles were observed when these sequential isolate pairs of C. albicans were analyzed by RFLP and RAPD assays. Variations in the genotype were complementary to those in the phenotypic characteristics for some isolates. In conclusion, irradiation-induced xerostomia seems to favor intraoral colonization of Candida species, particularly C. albicans, which appeared to undergo temporal modifications in clonal profiles both phenotypically and genotypically following hygienic and preventive oral care which included topical antifungal therapy, if indicated. We postulate that the observed ability of Candida species to undergo genetic and phenotypic adaptation could strategically enhance its survival in the human oral cavity, particularly when salivary defenses are impaired.
journal_name
J Clin Microbioljournal_title
Journal of clinical microbiologyauthors
Leung WK,Dassanayake RS,Yau JY,Jin LJ,Yam WC,Samaranayake LPsubject
Has Abstractpub_date
2000-06-01 00:00:00pages
2219-26issue
6eissn
0095-1137issn
1098-660Xjournal_volume
38pub_type
杂志文章abstract::This study demonstrates the dynamics in the epidemiology of hepatitis C virus subtypes. Subtypes 3a and 4a have become increasingly prevalent in patients where an infection within recent years can be assumed. Evidence is presented that the subtypes observed among younger patients can spread rapidly and lead to signifi...
journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/jcm.40.5.1866-1868.2002
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.15.1.184-186.1982
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.36.11.3378-3381.1998
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.13.4.646-651.1981
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.31.4.1009-1012.1993
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.33.4.968-972.1995
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.19.2.215-217.1984
更新日期:1984-02-01 00:00:00
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.26.3.570-572.1988
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.25.8.1421-1423.1987
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.31.7.1896-1898.1993
更新日期:1993-07-01 00:00:00
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.27.7.1441-1445.1989
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.42.12.5757-5766.2004
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.27.10.2214-2217.1989
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.32.10.2382-2386.1994
更新日期:1994-10-01 00:00:00
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.01910-14
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abstract::During 1984, the recovery of enteric pathogens from patients with acute diarrhea was enhanced by the use of both rectal swab and stool specimens. With 513 patients for whom both methods were used, the overall recovery rate was increased a minimum of about 10%. Almost 50% of the organisms recovered were detected by onl...
journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.25.1.158-159.1987
更新日期:1987-01-01 00:00:00
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.24.5.749-752.1986
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/jcm.41.12.5676-5682.2003
更新日期:2003-12-01 00:00:00
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.29.1.62-69.1991
更新日期:1991-01-01 00:00:00
abstract::Rapid detection and accurate identification of methicillin-resistant staphylococci are critical for the effective management of infections caused by these organisms. We describe a multiplex PCR-based assay for the direct detection of methicillin-resistant staphylococci from blood culture bottles (BacT/Alert; Organon-T...
journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/jcm.40.8.2786-2790.2002
更新日期:2002-08-01 00:00:00
abstract::The genetic compositions of 71 isoniazid-resistant Mycobacterium tuberculosis strains from Poland were determined by spoligotyping. Nearly 80% of the isolates belonged to either the T or the Haarlem family. The genotypic diversity was largely due to variation within those families. The scarcity of imported genotypes s...
journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.01315-08
更新日期:2008-12-01 00:00:00
abstract::We have used a polymerase chain reaction (PCR) to examine cervical cancer biopsy specimens and pelvic lymph nodes for the presence of human papillomavirus type 16 (HPV 16) DNA. Of the 75 cervical specimens tested, 36 (48%) were positive for HPV 16 in the PCR. A total of 65 pelvic lymph nodes removed during radical sur...
journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.30.1.233-236.1992
更新日期:1992-01-01 00:00:00
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journal_title:Journal of clinical microbiology
pub_type: 杂志文章
doi:10.1128/JCM.29.2.236-243.1991
更新日期:1991-02-01 00:00:00