For direct identification of Candida albicans from other Candida species, the chlamydospore formation and the mycelial transition induced by high temperature and by sera were examined in 198 Candida isolates. The germ tubes of C. albicans developed early at 30 min in high temperature-induction, but at 60 min in serum-induction. C. albicans generated germ tubes well at concentrations lower than 2 x 10(7) cells/ml, but the germ tube formation was markedly restrained at concentrations higher than 4 x 10(7) cells/ml. In a serum-free, yeast extract-peptone-dextrose (YEPD) medium, C. albicans grew as a yeast form at 30 degrees C and as a mycelial form at 35-42 degrees C. Mycelial development was maximal at 37 degrees C in serum and at 39 degrees C in YEPD. Germ tubes were formed within 30 min in YEPD at 39 degrees C, but after 60 min in serum at 37 degrees C. Our examination showed that the 39 degrees C-induced germ tube formation tests were very reliable (sensitivity 100%, specificity 100%) at discerning C. albicans from other Candida species. These results suggest that the high temperature-induced germ tube formation testing could be a useful identification method of C. albicans in clinical laboratories.
Candida albicans/physiology ; Candida albicans/isolation & purification* ; Sensitivity and Specificity ; Temperature

OBJECTIVE: To investigate the characteristics of growth and metabolism and the toxicity of under different conditions. METHODS: We observed the growth of and under routine culture conditions and in different pH and salt concentrations, and compared their activities of sugar fermentation using microbiochemical reaction tubes. Four-week-old nude mice were randomized into infection group (=5), infection group (=5) and control group (=5) for intragastric administration of 0.3 mL suspension the two (5×10 cfu/mL) or 0.3 mL normal saline. Samples of the liver, kidney, intestine, feces and blood were taken for analysis of the distribution and toxicity of by fungal culture and histopathological examination. RESULTS: exhibited logarithmic growth at 8-24 h after inoculation and showed stable growth after 24 h. showed optimal growth within the pH value range of 5-7 with a growth pattern identical to that of . grew better than in media containing 5% and 10% NaCl, and could ferment glucose, sucrose, trehalose and sorbitol. could be isolated from the feces, blood, liver and kidney of infected nude mice, and the liver had the highest fungal load (5.7 log cfu/g). could cause pathological changes in the liver and intestine of the mice, but with a lesser severity as compared with . CONCLUSIONS exhibits optimal growth in mildly acidic or neutral conditions with a high salt tolerance, and can potentially penetrate the intestinal barrier into blood and lead to tissue injuries in hosts with immunosuppression.
Animals ; Candida ; growth & development ; isolation & purification ; Candida albicans ; growth & development ; Candidiasis ; microbiology ; Culture Media ; Mice ; Mice, Nude ; Random Allocation

OBJECTIVETo investigate the clinical features of Candida albicans sepsis in preterm infants.

METHODSRetrospective analysis was performed on the clinical data of 13 preterm infants with Candida albicans sepsis, who were born at 28 to 36 weeks of gestational age and who weighed between 1400 and 2815 g.

RESULTSThe infants were infected with Candida albicans at the age of 19±11 d, with the main clinical manifestations being apnea, poor response, poor skin perfusion, blood oxygen concentration decrease, dark skin, yellowish skin, heart rate increase in the rest state, copious phlegm and difficulty in weaning from the ventilator. The infants showed significantly decreased platelet and increased C-reactive protein (CRP), platelet distribution width (PDW), alanine transaminase (ALT), creatine kinase isoenzyme-MB (CK-MB), total bilirubin (TBIL), creatine kinase (CK), and lactate dehydrogenase (LDH). CK and LDH were significantly decreased after 2 weeks of antifungal therapy. Only 3 cases developed drug resistance to fluconazole and these showed response when treated with voriconazole instead. Of the 13 cases, 10 were cured, 2 abandoned therapy and 1 died.

CONCLUSIONSThe clinical manifestations of Candida albicans sepsis are nonspecific in preterm infants. Infectious diseases are probably caused by Candida albicans in preterm infants 2-3 weeks after birth. Preterm infants show decreased platelet and increased CRP, PDW, ALT, CK-MB, TBIL, CK, and LDH when infected with Candida albicans.

Candida albicans ; isolation & purification ; Candidemia ; complications ; diagnosis ; drug therapy ; Female ; Humans ; Infant, Newborn ; Infant, Premature ; Male

OBJECTIVETo address the features of the fungal infection after burn injury in clinic.

METHODSThree thousand nine hundred and nine burn patients admitted to our institute from Jan. 2003 to Dec. 2006 were involved in this study. Two thousand two hundred and seventy-one samples were harvested for fungal detection by culture from 467 patients suspected to be infected by fungi based on their clinic manifestations. The collected samples included wound tissue, blood, urine, stool, sputum, catheters and others. The antibiotic sensitivity of the identified fungi were determined by routine method. When same kind of fungus was found from different samples taken from one patient, it was recorded as one positive sample. The samples were ranked in an ascending order as wound secretion, stool, urine, sputum and bronchial alveolar lavage fluid, arteriovenous catheter or urinary catheter, blood. Only the positive sample of the highest rank source was recorded as the positive strain of fungus from this particular patient.

RESULTSIt was found 61 fungal positive samples from the 2271 samples collected. Out of 467 patients, 38 strains of fungi were detected from 36 burn patients during the investigated period, the incidence was 0.92% (36/3909). The most three commonest types among the identified 38 strains of fungi were Candida tropicalis (42.1%), Candida albicans (31.6%) and Candida famata (T. Famata, 10.5%). The drug sensitivity tests demonstrated that most of the strains detected in this investigation, with the exception of candida glabrata, were sensitive to most of the routine antimycotics agents such as Amphotericin B, Fluconazole, and Itraconazole etc. Among the 36 fungus positive patients, in 18 patients the burn area exceeded 80% TBSA, 12 patients with 50%-79% TBSA, 4 patients with 30%-49% TBSA, and in 2 patients the burn area was smaller than 30% TBSA. It was found most of the fungal infections (77.78%) occurred 2 weeks after burn injury, and 8 of the 36 fungus-infected patients died (the mortality was 22.22%). Conclusions Further examinations are necessary to confirm the diagnosis in burn patients suspected to have fungal infection. Once fungal infections are confirmed, antimycotic therapy must be started immediately.

Burns ; microbiology ; Candida ; isolation & purification ; Humans ; Incidence ; Microbial Sensitivity Tests ; Mycoses ; drug therapy ; pathology

OBJECTIVETo establish the validation method and criteria for counting bacteria and fungi in microbial limit test which is described in the Pharmacopeia of China (ChP) 2005.

METHODAccording to the method set up for validation, the tested microorganisms with known counts were added to samples followed by the determination of the recovery.

RESULTWith different preparing method for testing samples, the recoveries for the tested microorganisms in testing samples were found to be over 70%.

CONCLUSIONValidation method for counting contaminated bacteria and fungi in drugs is recommended to follow the method established in this paper. The recovery for tested microorganisms should be not less than 70%.

Aspergillus niger ; isolation & purification ; Bacillus subtilis ; isolation & purification ; Bacteria ; isolation & purification ; Candida albicans ; isolation & purification ; Colony Count, Microbial ; methods ; Drug Contamination ; Drugs, Chinese Herbal ; standards ; Escherichia coli ; isolation & purification ; Fungi ; isolation & purification ; Staphylococcus aureus ; isolation & purification

OBJECTIVETo compare the characteristics of urinary tract infection (UTI) between kidney transplant recipients and non-recipient patients.

METHODSForty-nine kidney transplant recipients with UTI (69 episodes) and 401 non-recipient patients with UTI (443 episodes) admitted in Nanfang Hospital from January 2003 to August 2014 were enrolled in the study. The characteristics of UTI were compared between two groups.

RESULTSIn both groups of UTI, female patients comprised a greater proportion (63.3% and 58.6%) and Escherichia coli was the most common pathogen isolated (37.7% and 34.1%). However, the infection rate of Klebsiella pneumonia in recipients was higher than that in non-recipients (11.6% vs 3.2%, P= 0.001), while the infection rate of Candida albicans was lower (1.5% vs 11.3%, P=0.008) than that in non-recipients. Recipients were likely to develop antibiotic resistance and with a higher recurrence rate than non-recipient patients (38.8% vs 16.7%, P<0.001). Compared to non-recipient UTI patients, the symptoms of urinary irritation in recipient UTI patients were more common. There was higher percentage of neutrophil granulocyte (72.65% ± 1.90% vs 68.59% ± 0.73%, P=0.048), lower proportion of lymphocytes (17.73% ± 1.27% vs 21.28% ± 0.61%, P=0.037), and less platelets [(187.64 ± 10.84) × 10(9)/L vs (240.76 ± 5.26) × 10(9)/L, P<0.01] in recipients than in non-recipient UTI patients.

CONCLUSIONThese results indicate that the characteristics of UTI in kidney transplantation recipients and non-recipients patients are different.

Candida albicans ; isolation & purification ; Escherichia coli ; isolation & purification ; Female ; Humans ; Kidney Transplantation ; Klebsiella pneumoniae ; isolation & purification ; Male ; Transplant Recipients ; Urinary Tract Infections ; epidemiology ; pathology

BACKGROUND: We utilized results from the ARTEMIS DISK Global Antifungal Surveillance Program to evaluate the species distribution and fluconazole and voriconazole susceptibilities of yeast isolates from clinical specimens in South Korea from 2001 to 2007. METHODS: Data were collected on 5,665 yeast isolates from all body sites at three locations. All investigators tested clinical yeast isolates using the CLSI M44-A disk diffusion method. Test plates were automatically read and results were recorded using the BIOMIC image analysis plate reader system (Giles Scientific, USA). Species, drug, zone diameter, susceptibility category, and quality control results were collected quarterly via e-mail for analysis. RESULTS: Candida albicans was the most common isolate, but a progressive increase in non-C. albicans Candida and noncandidal yeast species has been observed in recent years. The overall percentages of isolates in each category (susceptible, susceptible dose dependent, and resistant) were 98.8%, 0.5%, and 0.7% and 99.2%, 0.2%, and 0.6% for fluconazole and voriconazole, respectively. Candida of 3 species exhibited decreased susceptibility to fluconazole (<90% S) in the order of that seen with the resistant (R) species: C. krusei, C. guilliermondii, and C. glabrata. Emerging resistance to fluconazole or voriconazole was documented among isolates of Cryptococcus neoformans, Trichosporon spp., and Rhodotorula spp. CONCLUSIONS: The species distribution and antifungal susceptibilities of yeasts may differ according to specimen type, testing method, hospital, and geographic region. Therefore, further large-scaled, long-term surveillance studies are needed to isolate yeasts and to confirm the species distribution and antifungal susceptibilities of yeast isolates from clinical specimens in Korea.
Antifungal Agents/*pharmacology ; Candida/isolation & purification ; Cryptococcus neoformans/isolation & purification ; Disk Diffusion Antimicrobial Tests ; *Drug Resistance, Fungal ; Fluconazole/pharmacology ; Hospitals ; Humans ; Pyrimidines/pharmacology ; Republic of Korea ; Rhodotorula/isolation & purification ; Triazoles/pharmacology ; Trichosporon/isolation & purification ; Yeasts/*drug effects/isolation & purification

OBJECTIVETo investigate the distribution of pathogenic C.albican genotype and Candida species in association with the severity of vulvovaginal candidiasis (VVC).

METHODSPolymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) of the internal transcribed spacer analysis was employed to identify the Candida species isolated from the vaginal secretions of 198 patients with acute VVC. SSCP and GeneScan analyses of microsatellite locus I polymorphism were used to determine the genotypes of the clinical isolates of C. albican associated with VVC. All the patients were scored for clinical signs and symptoms to evaluate the severity of VVC.

RESULTSA total of 198 Candida strains were isolated from VVC patients, including 140 (70.7%) C. albicans strains and 58 (29.3%) non-albicans strains. In the 95 patients with severe VVC and 103 with mild-moderate VVC, C.albican was detected in 62.1% and 76.6% of the patients, respectively (P=0.011). Thirty-eight microsatellite locus I genotypes were detected in 140 unrelated C. albican strains, among which the dominant genotypes 30-45 (44 strians, 31.43%) and 32-46 (23 strains, 16.43%) were the most common, followed by genotypes 30-46 (4 strains, 2.86%) and 32-47 (9 strains, 6.42%). The overall frequencies of the 4 genotypes were significantly higher in severe VVC than in mild-moderate VVC cases (77.9% vs 42.0%, P<0.001).

CONCLUSIONC. albicans remains the most common pathogenic Candia species in patients with VVC, but the non-alibcans species seem more likely to cause severe VVC. The dominant genotypes of C. albicans with a tropism for the vagina are correlated to the severity of VVC.

Adolescent ; Adult ; Candida ; classification ; isolation & purification ; Candida albicans ; genetics ; isolation & purification ; Candidiasis, Vulvovaginal ; microbiology ; Female ; Genotype ; Humans ; Middle Aged ; Polymerase Chain Reaction ; methods ; Polymorphism, Single-Stranded Conformational ; Severity of Illness Index ; Young Adult

Lipase from Candida sp. 99-125 was immobilized by physical adsorption onto macroporous resins. The results showed that the nonpolar resin NKA was the best carrier used in low aqueous media. 98.98% of degree of immobilization can be achieved when the adsorption procedure was performed in the presence of heptane. The hydrolytic activity and the apparent activity recovery of lipase adsorbed on resin in heptane was 4.07 and 3.43 times higher than that of lipase adsorbed in sodium phosphate buffer, respectively. The catalytic properties of immobilized lipase for production of biodiesel in low aqueous media were studied. Immobilized lipase displayed the highest activity when the crude enzyme/resin weight ratio was 1.92:1 and the water content(water/oil weight ratio) was 15% at 40 degrees C under pH 7.4. As lipase was adsorbed on NKA in heptane to produce biodiesel, the batch conversion rate can reach 97.3% when a three-step methanolysis protocol was used. After 19 consecutive batches, the conversion rate remained 70.2%.
Candida ; enzymology ; Enzymes, Immobilized ; metabolism ; Gasoline ; Lipase ; isolation & purification ; metabolism ; Porosity ; Resins, Synthetic ; chemistry ; Soybean Oil ; chemistry

OBJECTIVETo explore the influence of Candida albicans (Ca) on the motility and ultrastructure of human spermatozoa and its possible mechanism.

METHODSSemen samples obtained from 10 healthy volunteers by masturbation were prepared by the swim-up technique and sperm density to 40 x 10(6)/ml. The samples were then inoculated at 37 degrees C with different concentrations of a uropathogenic strain of Ca isolated from an outpatient, with initial fungi/spermatozoa ratios varying among 1:1 (Group A), 1:10 (Group B), 1:100 (Group C), 1:1000(Group D), and 1:10,000 (Group E). And Group F containing Ham's F-10 only was found as the negative control. Motion parameters were analysed by computer-aided sperm analyzer (CASA) at 0 hour, 1 hour, 2 hours and 4 hours respectively. Modalities of spermatozoa and possible adherence and/or agglutination were observed under the light microscope. Finally, all the samples were studied by transmission electron microscopy.

RESULTSDistinct adhesion of spermatozoa to Ca and agglutination were noticed. In all the motion parameters, progressive motility was affected most and dependent upon incubation time and bacterial concentration. Progressive motility showed a significant difference between Group A and the control (P < 0.01). With the prolongation of incubation time, other parameters were showing more and more differences. Analysis by electron microscopy revealed multiple ultrastructural damages.

CONCLUSIONCa significantly inhibits human sperm motility and decreases sperm viability in vitro. Its mechanism is possibly related to Ca's adhesion to human spermatozoa and the impairment inflicted by Ca to sperm ultrastructure.

Candida albicans ; isolation & purification ; physiology ; Candidiasis, Vulvovaginal ; microbiology ; Female ; Humans ; In Vitro Techniques ; Male ; Sperm Motility ; Spermatozoa ; physiology ; ultrastructure