Oral microbiota carriage in patients with multibracket appliance in relation to the quality of oral hygiene

Background: The present study aimed to investigate the prevalence of oral microbiota (Candida species (spp.), Streptococcus mutans, and Lactobacilli) in patients with multibracket (MB) appliances in relation to the quality of oral hygiene. Saliva and plaque samples were collected from three groups of 25 patients each (good oral hygiene (GOH), poor oral hygiene (POH), and poor oral hygiene with white spot lesions (POH/WSL)). Counts of colony forming units (CFU) of the investigated oral microbiota were compared using Chi-square and Mann–Whitney U tests. Results: Both saliva and plaque samples showed a high prevalence of Candida spp. in all patients (saliva: 73.4 %, plaque: 60.9 %). The main Candida species was C. albicans. The salivary CFU of Candida spp. in the GOH group was significantly lower than that in the POH group (p?=?0.045) and POH/WSL group (p?=?0.011). S. mutans was found in the saliva and plaque samples of all patients. Lactobacilli were found in the saliva samples of all patients and in 90.7 % of the plaque samples. In the saliva samples, the CFU of Lactobacilli were more numerous in the POH and POH/WSL groups than in the GOH group (p?=?0.047). Conclusions: The investigated sample of patients showed a high carriage of oral Candida spp. Patients with WSL formation during MB appliance treatment exhibited higher counts of Candida and Lactobacilli compared with patients with good oral hygiene. Independent of oral hygiene quality, S. mutans was detected in all patients

The transmission of nosocomial pathogens in an intensive care unit: a space–time clustering and structural equation modelling approach

We investigated the incidence of cases of nosocomial pathogens and risk factors in an intensive treatment unit ward to determine if the number of cases is dependent on location of patients and the colonization/infection history of the ward. A clustering approach method was developed to investigate the patterns of spread of cases through time for five microorganisms [methicillin-resistant Staphylococcus aureus (MRSA), Acinetobacter spp., Klebsiella spp., Candida spp., and Pseudomonas aeruginosa] using hospital microbiological monitoring data and ward records of patient-bed use. Cases of colonization/infection by MRSA, Candida and Pseudomonas were clustered in beds and through time while cases of Klebsiella and Acinetobacter were not. We used structural equation modelling to analyse interacting risk factors and the potential pathways of transmission in the ward. Prior nurse contact with colonized/infected patients, mediated by the number of patient-bed movements, were important predictors for all cases, except for those of Pseudomonas. General health and invasive surgery were significant predictors of cases of Candida and Klebsiella. We suggest that isolation and bed movement as a strategy to manage MRSA infections is likely to impact upon the incidence of cases of other opportunist pathogen

Hubungan Antara Sifat Dan Metabolit Candida Spp. Dengan Patogenesis Kandidiasis

Candida spp. is the most frequent fungi which causes opportunistic infections in humans. In ‘immunocompromised’ hosts, severe systemic candidiasis may occurred. Candida spp. grows optimally at  37°C and a relatively neutral pH, the condition which is similar to that of the human body. Candida spp.is a dimorphic fungus and has the ability to adhere to certain surfaces and to form biofilms. Candida spp. produced ‘secretes aspartyl proteinase’ (Sap) which assist this organism in colonization and infecting the host. Candida spp. also secreted phospholipase, lipase, hyaluronidase, chondroitin sulfatase and enolase, which are responsible as its virulence factors. Through its metabolism, Candida spp. produces neurotoxins such as formaldehyde, acetaldehyde, arabinitol and arabitol. High concentration of ethanol, one of Candida’s metabolite, may cause alcohol intoxication in the host. Functional characteristics and metabolites of Candida spp. apparently play an important role in the pathogenesis of candidiasis. The presence of Candida spp. is not always harmful to humans. Candida spp. is a normal flora in human body. This organism also produces useful metabolites for food industry, such as xylitol, erythritol, mannitol and ethanol

Degradation of human kininogens with the release of kinin peptides by extracellular proteinases of Candida spp.

The secretion of proteolytic enzymes by pathogenic microorganisms is one of the most successful strategies used by pathogens to colonize and infect the host organism. The extracellular microbial proteinases can seriously deregulate the homeostatic proteolytic cascades of the host, including the kinin-forming system, repeatedly reported to he activated during bacterial infection. The current study assigns a kinin-releasing activity to secreted proteinases of Candida spp. yeasts, the major fungal pathogens of humans. Of several Candida species studied, C. parapsilosis and C. albicans in their invasive filamentous forms are shown to produce proteinases which most effectively degrade proteinaceous kinin precursors, the kininogens. These enzymes, classified as aspartyl proteinases, have the highest kininogen-degrading activity at low pH (approx. 3.5), but the associated production of bradykinin-related peptides from a small fraction of kininogen molecules is optimal at neutral pH (6.5). The peptides effectively interact with cellular B2-type kinin receptors. Moreover, kinin-related peptides capable of interacting with inflammation-induced B1-type receptors are also formed, but with a reversed pH dependence. The presented variability of the potential extracellular kinin production by secreted aspartyl proteinases of Candida spp. is consistent with the known adaptability of these opportunistic pathogens to different niches in the host organism

Epidemiology of hematogenous infections due to Candida spp

Candida spp is associated to almost 80% of all nosocomial fungal infections and is considered a major cause of blood stream infections. Candida spp is the fourth most common cause of blood stream infections in the United States, where this agent is responsible for 8% of all invasive infections documented in this site. At the present, non-albicans species are related to at least 50% of all invasive infections due to Candida spp and they present differences in terms of clinical outcome as well as susceptibility to antifungal drugs. The crude mortality rate of candidemia is between 40 and 60% which makes this infection an important challenge for all clinicians from tertiary care hospitals of diverse different countries.O gênero Candida spp é responsável por cerca de 80% das infecções fúngicas no ambiente hospitalar e constitui causa relevante de infecções de corrente sanguínea. Nos Estados Unidos da América, Candida spp é a quarta causa mais comum de infecções de corrente sanguínea, respondendo por cerca de 8% dos casos das infecções documentadas neste sítio. Espécies não-albicans respondem hoje por ao menos 50% das infecções invasivas por Candida spp, apresentando peculiaridades de história natural e sensibilidade a antifúngicos. A mortalidade geral de fungemias por Candida spp é da ordem de 40 a 60%, tornado esta complicação infecciosa um grande desafio para os clínicos que trabalham em hospitais terciários em diferentes países.Universidade Federal de São Paulo (UNIFESP)Hospital do Servidor Público Estadual de São PauloUNIFESPSciEL

Anti fungal activity of alcoholic extract of Peganum harmala seeds

In our study, it was aimed to determine antifungal activity of Peganum harmala on medically important yeasts and molds in vitro. Fungal suspensions of Candida spp and aspergillus spp isolated from the clinical specimens were treated with serial dilutions of P. harmala alcoholic extract in Sabouraud Broth. The titers included: 1/20, 1/40, 1/80, 1/160, 1/320, 1/640, and incubated for 24 h at 30°C. Anti fungal activity of the extract was determined as MIC and MFC. For the determination of MFC, a small volume of above serial dilutions was cultured on SGA 4% medium. After 24 to 72 h of incubation at 30°C, the cultures were looked for fungal growth. The highest and lowest inhibitory effects of P. harmala extract were determined on C. glabrata (MIC: 0.312 mg/ml) and C. albicans (MIC: 1.25 mg/ml), respectively. The MFC for Candida species was differed from 0.62 to 2.5 mg/ml. The highest fungicidal effect was seen on C. glabrata and C. tropicalis (MFC: 0.62 and 0.125 mg/ml, respectively) and the lowest was for C. albicans (MFC: 2.5 mg/ml). The treatment of Aspergillus suspensions with Perganum extract showed a decreasing of growth and sporolation without definite inhibition. The alcoholic extract of P. harmala showed a fungicidal activity on opportunistic yeasts, Candida spp, and a decreasing sporolation for aspergillus most importamt species. © 2011 Academic Journals

Характеристика тканевых и культуральных форм Candida species, выделенных от новорожденных детей

The results of microbiological researches of newborn children, study of biological, including pathogenic, properties of Candida spp. in tissue and cultural forms are presented in the article.У статті представлені результати мікробіологічного обстеження новонароджених дітей, вивчення біологічних, у тому числі і патогенних, властивостей тканевої і культуральної форм Candida spp. // Русск. версия: В статье представлены результаты микробиологического обследования новорожденных детей, изучения биологических свойств, в том числе и патогенных, свойств культуральных и тканевых форм Candida spp. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/279

Intensive care unit-related fluconazole use in Spain and Germany: patient characteristics and outcomes of a prospective multicenter longitudinal observational study

Background: Candida spp. are a frequent cause of nosocomial bloodstream infections worldwide. Objective: To evaluate the use patterns and outcomes associated with intravenous (IV) fluconazole therapy in intensive care units in Spain and Germany. Patients and methods: The research reported here was a prospective multicenter longitudinal observational study in adult intensive care unit patients receiving IV fluconazole. Demographic, microbiologic, therapy success, length of hospital stay, adverse event, and all-cause mortality data were collected at 14 sites in Spain and five in Germany, from February 2004 to November 2005. Results: Patients (n = 303) received prophylaxis (n = 29), empiric therapy (n = 140), preemptive therapy (n = 85), or definitive therapy (n = 49). A total of 298 patients (98.4%) were treated with IV fluconazole as first-line therapy. The treating physicians judged therapy successful in 66% of prophylactic, 55% of empiric, 45% of preemptive, and 43% of definitive group patients. In the subgroup of 152 patients with proven and specified Candida infection only, 32% suffered from Candida specified as potentially resistant to IV fluconazole. The overall mortality rate was 42%. Conclusion: Our study informs treatment decision makers that approximately 32% of the patients with microbiological results available suffered from Candida specified as potentially resistant to IV fluconazole, highlighting the importance of appropriate therapy

The epidemiology of Candida species isolated from urinary tract infections

Candida spp. are members of a genus, including closely related fungal species that cause a variety of infections. Objectives: The aim of this study was the isolation of various Candida species from vulvovaginitis and urethra of patients in Neyshabur, Northeast Iran from 2013 to 2015. Methods: This descriptive-analytical and cross-sectional study was performed to identify Candida spp. causing vulvovaginitis and Urinary Tract Infection (UTI) at a referral laboratory in Neyshabur district, Khorasan Razavi Province. A total of 451 vaginal and midstream urine samples were collected. Ten micro-liters of each specimen was cultured on CHROM agar plates and then incubated at 37°C for 24 to 48 hours, aerobically. Candida species were identified based on colony morphology, germ tube production and micro-morphology on corn meal agar including 1% Tween 80. Results: The mean age of the patients was 34.7_16.3. Candida albicans was the predominant species isolated. Moreover, age groups of 21 to 30 and 0 to 1 years were the most and the least infected individuals. Moreover, Candida spp. were significantly morecommon in females compared to males (P value 103. Conclusions: In this study, C. albicans was the most common species isolated from patients with vulvovaginitis and UTI, and significantly more common amongst females compared to males. The prevalence of candida spp. had significantly declined from 2013 to 2015. Moreover, the candida spp. counts were mostly higher than 103cfu/mL