scholarly journals Virulence Factors and Antifungal Susceptibility Profile of C. tropicalis Isolated from Various Clinical Specimens in Alexandria, Egypt

2021 ◽  
Vol 7 (5) ◽  
pp. 351
Author(s):  
Mohammed A. El-Kholy ◽  
Ghada F. Helaly ◽  
Ebtisam F. El Ghazzawi ◽  
Gamal El-Sawaf ◽  
Sherine M. Shawky
Keyword(s):  
Virulence Factors ◽  
Biofilm Formation ◽  
Antifungal Susceptibility ◽  
Accurate Identification ◽  
Icu Patients ◽  
Clinical Specimens ◽  
High Incidence ◽  
Invasive Infections ◽  
Vitek 2 ◽  
Urinary Isolates

Background: The incidence of candidiasis caused by non-albicans Candida (NAC) species is increasing. Candida tropicalis has emerged as one of the most important NAC species. This study aims to examine the antifungal susceptibility profile and some virulence factors of C. tropicalis isolated from various clinical specimens. Methods: A total of 71 C. tropicalis isolates from various clinical specimens (69.01%, 18.31%, 9.86%, and 2.82% of isolates were collected from urine, respiratory samples, blood, and skin and soft tissue infections, respectively) from ICU patients in Alexandria, Egypt. The isolates were identified at species level by CHROMagar Candida and VITEK 2 compact system. Furthermore, the antifungal susceptibility was determined using the VITEK 2 system AST-YS07 card containing different antifungals. Hemolysin, phospholipase, and proteinase activity and biofilm formation were also tested as virulence factors. Results: Only 30 isolates (42.25%) were non-susceptible (MIC ≥ 4 µg/mL) to fluconazole, of which 28 isolates showed non-susceptibility (MIC ≥ 0.25 µg/mL) to voriconazole. All isolates showed both hemolysin and proteinase activities, while only 9 isolates (12.68%) showed phospholipase production and 70 isolates (98.59%) demonstrated biofilm formation. Strong biofilm production was observed among the blood culture isolates (85.71%), followed by the respiratory and urinary isolates (61.54% and 46.94%, respectively). Conclusions: This study sought to provide useful data on the antifungal susceptibility of C. tropicalis isolates from ICU patients suffering from invasive infections with an increased trend towards elevated MICs levels of both fluconazole and voriconazole. Due to the high incidence of systemic candidiasis and antifungal resistance, C. tropicalis is emerging as a serious root of infections. Therefore, early and accurate identification of Candida species along with susceptibility testing is of utmost importance.

Molecular diagnosis and antifungal resistance and biofilm production profiles among Candida species isolated from immunocompromised patients at Menoufia University Hospitals

2020 ◽  
Vol 29 (3) ◽  
pp. 37-45
Author(s):  
Mabrouk M Ghonaim ◽  
Azza Z. Labeeb ◽  
Alyaa I. Eliwa ◽  
Eman H. Salem
Keyword(s):  
Candida Species ◽  
Biofilm Formation ◽  
Antifungal Susceptibility ◽  
High Sensitivity ◽  
Antifungal Resistance ◽  
Common Source ◽  
Immunocompromised Patients ◽  
University Hospitals ◽  
Biofilm Production ◽  
Vitek 2

Background: Accurate and rapid identification of Candida species is necessary for proper diagnosis and treatment of candidiasis due to emergences of drug-resistant strains especially among immunocompromised patients. Objectives: Identification of Candida clinical isolates to the species level using different phenotypic and molecular methods. Biofilm-forming ability and antifungal resistance were also studied. Methodology: Sixty-nine Candida strains were isolated from 220 immunocompromised patients. Identification was performed using chromogenic Candida agar, VITEK 2 system and multiplex polymerase chain reaction (PCR). Biofilm formation was detected by the tube method and antifungal susceptibility was tested using the VITEK2 system. Results: The most common source of Candida isolates was from urine (33.3%) and ICUs (56.6%). VITEK 2 system detected 9 spp.: C. albicans (34.8%), C. tropicalis (21.7%), C. famata (8.7%), C. lusitaniae (7.2%), C. cruzi (7.2%), C. ciferri (5.8%), C. dubliniensis (5.8%), C. parapsilosis (5.8 %) and C. glabrata. Candida isolates showed high resistance to flucytocine (49.3%), and high sensitivity to fluconazole, micafungin, voriconazole and caspofungin (88.4%, 81.2% and 81.2 % respectively). Only 30.4% of all Candida isolates were biofilm producers. There was a positive relationship between antifungal resistance and biofilm formation among Candida isolates. Conclusion: C. albicans was the predominant species. Chromogenic Candida agar and VITEK 2 system were valuable tests compared to PCR in speciation of Candida isolates. Antifungal susceptibility was significantly related to biofilm production and its evaluation is important for proper treatment..

scholarly journals Virulence Factors Contributing to Pathogenicity ofCandida tropicalisand Its Antifungal Susceptibility Profile

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Sachin C. Deorukhkar ◽  
Santosh Saini ◽  
Stephen Mathew
Keyword(s):  
Virulence Factors ◽  
Biofilm Formation ◽  
Antifungal Susceptibility ◽  
Common Species ◽  
Blood Cultures ◽  
Haemolytic Activity ◽  
Phospholipase Activity ◽  
Fluconazole Resistance ◽  
Activity Maximum ◽  
The Past

The incidence of invasive candidiasis has increased over the past few decades. AlthoughCandida albicansremains by far the most common species encountered, in recent years shift towards non-albicans Candidaspecies likeCandida tropicalisis noted. Here in this study we determined the virulence factors and antifungal susceptibility profile of 125C. tropicalisisolated from various clinical specimens. Biofilm formation was seen in 53 (42.4%) isolates. Coagulase production was noted in 18 (14.4%) isolates. Phospholipase enzyme was the major virulent factor produced byC. tropicalisisolates. A total of 39 biofilm forming isolates showed phospholipase activity. Proteinase activity was demonstrated by 65 (52%) isolates. A total of 38 (30.4%) isolates showed haemolytic activity. Maximum isolates demonstrated resistance to fluconazole. Fluconazole resistance was more common inC. tropicalisisolated from blood cultures. Antifungal resistance was more in isolates possessing the ability to produce phospholipase and biofilm.C. tropicalisexhibit a great degree of variation not only in their pathogenicity but also in their antifungal susceptibility profile. The identification of virulence attributes specific for each species and their correlation with each other will aid in the understanding of the pathogenesis of infection.

scholarly journals Virulence Factors and Azole-Resistant Mechanism of Candida Tropicalis Isolated From Candidemia

2021 ◽  
Author(s):  
Elahe Sasani ◽  
Sadegh Khodavaisy ◽  
Sassan Rezaie ◽  
Mohammadreza Salehi ◽  
Muhammad Getso ◽  
...  
Keyword(s):  
Virulence Factors ◽  
Candida Tropicalis ◽  
Biofilm Formation ◽  
Molecular Mechanisms ◽  
Antifungal Susceptibility ◽  
Cell Surface Hydrophobicity ◽  
Surface Hydrophobicity ◽  
Azole Resistance ◽  
Virulence Determinants ◽  
Fluconazole Resistant

Abstract Background Virulence factors intensify the pathogenicity of Candida species in candidemia. Limited knowledge exists regarding the azole-resistant mechanism and virulence factors of Candida tropicalis. Consequently, we aimed to evaluate the virulence factors and the molecular mechanisms of azole resistance among C. tropicalis isolated from bloodstream infection. Materials and methods Forty-five C. tropicalis isolates recovered from candidemia patients were evaluated for virulence factors, including extracellular enzymatic activities, cell surface hydrophobicity (CHS), and biofilm formation. Antifungal susceptibility pattern and expression level of ERG11, UPC2, MDR1, and CDR1 genes of eight azole resistance C. tropicalis isolates were assessed. Results The isolates expressed different frequencies of virulence determinants as follows: coagulase 4 (8.9%), phospholipase 4 (8.9 %), proteinase 31 (68.9 %), CSH 43 (95.6 %), esterase 43 (95.6 %), hemolysin 44 (97.8%), and biofilm formation 45 (100%). All the isolates were susceptible to amphotericin B and showed the highest resistance to voriconazole. The high expression of ERG11 and UPC2 genes in fluconazole-resistant C. tropicalis isolates were observed. Conclusion C. tropicalis isolated from candidemia patients extensively displayed capacities for biofilm formation, hemolysis, esterase activity, and hydrophobicity. In addition, the overexpression of ERG11 and UPC2 genes can be considered as one of the possible mechanisms of azole resistance.

Phenotypic Detection and Biofilm Formation among Pseudomonas aeruginosa Isolated from Different Sites of Infection

2019 ◽  
Vol 10 (02) ◽  
Author(s):  
Ilham A Bunyan ◽  
Oday M Hadi ◽  
Hussein A K Al-Mansoori
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Virulence Factors ◽  
Biofilm Formation ◽  
Trichloroacetic Acid ◽  
Egg Yolk ◽  
Staining Technique ◽  
Protease Production ◽  
Clinical Samples ◽  
Bacterial Biofilms ◽  
Vitek 2

In The present study, included the collection of (100) samples from different clinical sites. Clinical samples were collected from patients who were visit and admitted All-Hilla teaching hospital at the period from November (2017) to February (2018). Cultural, biochemical and VITEK2 system were used for identification, and depending on the VITEK2 system (VITEK-2 GN Kit), revealed that twenty one (21) Pseudomonas aeruginosa isolates were recovered, The percentage conformational identification of P. aeruginosa was performed using VITEK2 system of (21) P. aeruginosa was (99%). Nine(42.8%) samples were isolated from burns, 5(23.8%) samples from wound, 3(14.2%) from urine, 2(9.5%) from ear swab, and 1(4.7%) sample was isolated from both blood and sputum. The phenotypic detection of some virulence factors for all isolates were detected. Detection of capsule was done by using capsule staining technique was carried out for P. aeruginosa isolates; it was found that all P. aeruginosa isolates (100%) have a capsule surrounding the bacterial cell. Hemolysin production by P. aeruginosa was studied; it was found that 12(57.1%) isolates were able to produce extracellular hemolysin on blood agar. P. aeruginosa isolates were also investigated for their ability to produce siderophores. The results showed that 9(42.8%) isolates of P. aeruginosa were able to produce siderophores. Protease production by P. aeruginosa isolates was studied; it was found that all these isolates (100%) have this enzyme as appear as a zone around the colony when being grown on (M9) media after adding of (3ml) of (5%) Trichloroacetic acid and incubation for (24 hrs.). Ability of P. aeruginosa to produce lipase has been investigated; it found that all these isolates (100%) were able to produce lipase after incubation for (48 hrs.) on egg yolk agar. Also, bacterial biofilms cause chronic diseases that are difficult to control and in the present study, differentiation of bacteria as biofilm producers and non-biofilm producers was done by using (ELISA) TCP method, a total of (21) isolates were tested for their ability to produce biofilm. From these isolates, (19) isolates were form strong biofilm, (2) isolates were form moderate biofilm.

scholarly journals Antifungal Susceptibility Patterns,In VitroProduction of Virulence Factors, and Evaluation of Diagnostic Modalities for the Speciation of PathogenicCandidafrom Blood Stream Infections and Vulvovaginal Candidiasis

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Chaitanya Tellapragada ◽  
Vandana Kalwaje Eshwara ◽  
Ruqaiyah Johar ◽  
Tushar Shaw ◽  
Nidhi Malik ◽  
...  
Keyword(s):  
Virulence Factors ◽  
Antifungal Susceptibility ◽  
Blood Stream ◽  
Vulvovaginal Candidiasis ◽  
Clinical Isolates ◽  
Blood Stream Infections ◽  
Specific Pcr ◽  
Vitek 2 ◽  
Species Specific

Candidaspp. have emerged as successful pathogens in both invasive and mucosal infections. Varied virulence factors and growing resistance to antifungal agents have contributed to their pathogenicity. We studied diagnostic accuracy of HiCromeCandidaDifferential Agar and Vitek 2 Compact system for identification ofCandidaspp. in comparison with species-specific PCR on 110 clinical isolates ofCandidafrom blood stream infections (54, 49%) and vulvovaginal candidiasis (56, 51%).C. albicans(61%) was the leading pathogen in VVC, whileC. tropicalis(46%) was prominent among BSIs. HiCrome Agar and Vitek 2 Compact had good measures of agreement (κ) 0.826 and 0.895, respectively, in comparison with PCR. We also tested these isolates forin vitroproduction of proteinase, esterase, phospholipases, and biofilms. Proteinase production was more among invasive isolates (P=0.017), while phospholipase production was more among noninvasive isolates (P=0.001). There was an overall increase in the production of virulence factors among non-albicansCandida. Identification of clinical isolates ofCandidaup to species level either by chromogenic agar or by Vitek 2 Compact system should be routinely done to choose appropriate therapy.

scholarly journals Non-albicans CandidaInfection: An Emerging Threat

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Sachin C. Deorukhkar ◽  
Santosh Saini ◽  
Stephen Mathew
Keyword(s):  
Candida Albicans ◽  
Virulence Factors ◽  
High Resistance ◽  
Fungal Pathogens ◽  
Antifungal Agents ◽  
Antifungal Susceptibility ◽  
Clinical Specimen ◽  
Antifungal Drugs ◽  
Clinical Specimens ◽  
The Past

The very nature of infectious diseases has undergone profound changes in the past few decades. Fungi once considered as nonpathogenic or less virulent are now recognized as a primary cause of morbidity and mortality in immunocompromised and severely ill patients.Candidaspp. are among the most common fungal pathogens.Candida albicanswas the predominant cause of candidiasis. However, a shift toward non-albicans Candidaspecies has been recently observed. These non-albicans Candidaspecies demonstrate reduced susceptibility to commonly used antifungal drugs. In the present study, we investigated the prevalence of non-albicans Candidaspp. amongCandidaisolates from various clinical specimens and analysed their virulence factors and antifungal susceptibility profile. A total of 523Candidaspp. were isolated from various clinical specimens. Non-albicans Candidaspecies were the predominant pathogens isolated. Non-albicans Candidaspecies also demonstrated the production of virulence factors once attributed toCandida albicans. Non-albicans Candidademonstrated high resistance to azole group of antifungal agents. Therefore, it can be concluded that non-albicans Candidaspecies have emerged as an important cause of infections. Their isolation from clinical specimen can no longer be ignored as a nonpathogenic isolate nor can it be dismissed as a contaminant.

scholarly journals Identification and antifungal susceptibility of Saprochaete clavata from invasive infections in Turkey

2020 ◽  
Author(s):  
Esra Özkaya ◽  
İlknur Tosun ◽  
Enis Fuat Tüfekçi ◽  
Celal Kurtuluş Buruk ◽  
Neşe Kaklıkkaya ◽  
...  
Keyword(s):  
Antifungal Susceptibility ◽  
Diagnostic System ◽  
Opportunistic Pathogen ◽  
Clinical Samples ◽  
Clinical Specimens ◽  
Invasive Infections ◽  
Life Threatening ◽  
Susceptibility Tests ◽  
Antifungal Use

AbstractSaprochaete clavata is an emerging opportunistic pathogen, that causes life-threatening infections, but there are limited evidence and information about the evaluation of in vitro antifungal susceptibility test results. The aim of this study was to determine S. clavata isolates from clinical specimens and to investigate their in vitro antifungal susceptibility. S. clavata was identified by API ID20C AUX (BioMérieux, Brussels, Belgium), MALDI TOF (Bruker Daltonik, Germany), and ITS gene region sequencing. In vitro susceptibility tests were performed using Sensititre YeastOne (TREK Diagnostic System, East Grinstead, UK). During the study period, 4,736 fungi were isolated from various clinical samples and, S. clavata was identified in eight patients with underlying diseases namely, pancreatic neoplasma, acute myeloid leukaemie, follicular lymphoma, cholelithiasis. Anidulafungin and micafungin minimum inhibitory concentration values were 1–2 and 1–4 mg/L, respectively, while those of the azole group antifungals were much lower. This is the first study in Turkey reporting isolation, identification and antifungal susceptibilities of S. clavata from clinical specimens. Higher MIC values seen in some isolates suggest that continuous monitoring of sensitivity rates and observation of regional differences will thus be useful guides in determining infection control and antifungal use policies.

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