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1.
Article in English | MEDLINE | ID: mdl-30962920

ABSTRACT

The WHO SAVE LIVES: Clean Your Hands global hand hygiene campaign, launched in 2009 and celebrated annually on the 5th of May, features specific calls to action seeking to increase engagement from stakeholders' collaborations in hand hygiene improvement. WHO calls on everyone to be inspired by the global movement towards universal health coverage (UHC). Infection prevention and control (IPC), including hand hygiene, is critical to achieve UHC as it has a direct impact on quality of care and patient safety across all levels of the health services. In the framework of UHC, the theme for 5 May 2019 is "Clean care for all - it's in your hands". In this context, the WHO has launched a global survey to assess the current level of progress of IPC programmes and hand hygiene activities in healthcare facilities (HCFs) worldwide. This involved the creation of two tools for healthcare facilities: the WHO Infection Prevention and Control Assessment Framework (IPCAF) and the WHO Hand Hygiene Self-Assessment Framework (HHSAF). The objective of this paper is to provide case scenario-based simulation for IPC specialists to simulate and fully assimilate the correct completion of the HHSAF framework in a standardized format. The three case scenarios have been tested and are proposed for the reader to assess the HHSAF of different HCFs in a variety of contexts, even in low-resouce settings. They were designed for simulation training purposes to achieve standardization and interactive learning. These scenarios are meant to be used by professionals in charge of implementing a hand hygiene improvement strategy within their HCF, as well as for simulation and standardized training purposes prior to completing and submitting data for the 2019 WHO Global Survey. Additionally, information provided by the use of the HHSAF can easily be translated into action plans to support the implementation and improvement related to specific indicators of hand hygiene promotion. We invite all HCFs to participate in the 2019 WHO global survey and monitor the level of progress of their IPC programme and hand hygiene activities.


Subject(s)
Cross Infection/prevention & control , Hand Hygiene/methods , Infection Control/methods , Simulation Training/organization & administration , Guideline Adherence , Health Promotion/organization & administration , Humans , Patient Safety , Self-Assessment , Socioeconomic Factors , World Health Organization
2.
J Antimicrob Chemother ; 73(5): 1235-1241, 2018 05 01.
Article in English | MEDLINE | ID: mdl-29415120

ABSTRACT

Objectives: We describe the molecular characteristics of colistin resistance and its impact on patient mortality. Methods: A prospective cohort study was performed in seven different Turkish hospitals. The genotype of each isolate was determined by MLST and repetitive extragenic palindromic PCR (rep-PCR). Alterations in mgrB were detected by sequencing. Upregulation of pmrCAB, phoQ and pmrK was quantified by RT-PCR. mcr-1 and the genes encoding OXA-48, NDM-1 and KPC were amplified by PCR. Results: A total of 115 patients diagnosed with colistin-resistant K. pneumoniae (ColR-Kp) infection were included. Patients were predominantly males (55%) with a median age of 63 (IQR 46-74) and the 30 day mortality rate was 61%. ST101 was the most common ST and accounted for 68 (59%) of the ColR-Kp. The 30 day mortality rate in patients with these isolates was 72%. In ST101, 94% (64/68) of the isolates had an altered mgrB gene, whereas the alteration occurred in 40% (19/47) of non-ST101 isolates. The OXA-48 and NDM-1 carbapenemases were found in 93 (81%) and 22 (19%) of the total 115 isolates, respectively. In multivariate analysis for the prediction of 30 day mortality, ST101 (OR 3.4, CI 1.46-8.15, P = 0.005) and ICU stay (OR 7.4, CI 2.23-29.61, P = 0.002) were found to be significantly associated covariates. Conclusions: Besides ICU stay, ST101 was found to be a significant independent predictor of patient mortality among those infected with ColR-Kp. A significant association was detected between ST101 and OXA-48. ST101 may become a global threat in the dissemination of colistin resistance and the increased morbidity and mortality of K. pneumoniae infection.


Subject(s)
Anti-Bacterial Agents/pharmacology , Colistin/pharmacology , Drug Resistance, Bacterial , Genotype , Klebsiella Infections/microbiology , Klebsiella Infections/mortality , Klebsiella pneumoniae/classification , Adolescent , Adult , Aged , Aged, 80 and over , Child , Child, Preschool , Female , Gene Expression Profiling , Hospitals , Humans , Infant , Infant, Newborn , Klebsiella pneumoniae/drug effects , Klebsiella pneumoniae/genetics , Klebsiella pneumoniae/isolation & purification , Male , Middle Aged , Multilocus Sequence Typing , Polymerase Chain Reaction , Prospective Studies , Sequence Analysis, DNA , Survival Analysis , Turkey/epidemiology , Young Adult
3.
Chemotherapy ; 60(3): 151-6, 2014.
Article in English | MEDLINE | ID: mdl-25791941

ABSTRACT

BACKGROUND AND AIM: Tigecycline is a semi-synthetic tetracycline with activity against most multidrug-resistant (MDR) bacteria. METHODS: We studied in vitro activity of tigecycline by agar dilution (AD) and Etest methods to evaluate their correlation. The study included 206 isolates of extended-spectrum ß-lactamase (ESBL)-producing Escherichia coli, Klebsiella pneumoniae and MDR Acinetobacter baumannii recovered from blood cultures of patients of Baskent University between 2008 and 2010. RESULTS: ESBL-producing E. coli had MIC50/MIC90 values of 0.5/0.5 µg/ml by AD and 0.25/0.5 µg/ml by Etest. ESBL-producing K. pneumoniae had MIC50/MIC90 values of 1/2 µg/ml by AD and 0.75/2 µg/ml by Etest, whereas MDR A. baumannii had MIC50/MIC90 values of 4/4 µg/ml by AD and 2/4 µg/ml by Etest. The correlation between AD and Etest was weak for ESBL-producing E. coli and strong for ESBL-producing K. pneumoniae and MDR A. baumannii. Tigecycline MIC values for ESBL-producing E. coli were lower than the tigecycline concentration, while they were higher than the concentrations attainable by treatment doses for A. baumannii. CONCLUSION: Tigecycline is an appropriate agent in the treatment of E. coli bacteremia, but it is not for treating A. baumannii bacteremia. Tigecycline could be used for K. pneumoniae bacteremia treatment after determining its MIC value. Determining the MIC value by gold-standard methods is more appropriate due to the correlation between Etest and AD at high MIC values.


Subject(s)
Agar/chemistry , Drug Resistance, Multiple, Bacterial/drug effects , Gram-Negative Bacteria/drug effects , Minocycline/analogs & derivatives , Anti-Bacterial Agents/pharmacology , Bacteremia/drug therapy , Humans , Microbial Sensitivity Tests , Minocycline/pharmacology , Tigecycline
4.
J Infect Dev Ctries ; 7(12): 1012-5, 2013 Dec 15.
Article in English | MEDLINE | ID: mdl-24334952

ABSTRACT

Intrauterine devices (IUD) are frequently used as a family planning procedure in developing countries because they are easy to administer and governmental policies support their use in many countries. It is recommended that IUDs be removed or replaced after 10 years, but longer use is common, especially in developing countries. In some cases, rare infections such as pelvic inflammatory diseases, pelvic tuberculosis, or abdominopelvic actinomycosis related to IUD can develop. Pelvic actinomycosis is a rare disease and is often diagnosed incidentally during surgery. In recent years, there has been an increase in actinomycotic infections mostly due to long-term usage of IUD and forgotten intravaginal pessaries. It usually develops as an ascending infection. It is usually associated with non-specific symptoms such as lower abdominal pain, menstrual disturbances, fever, and vaginal discharge. The disease is sometimes asymptomatic. The rate of accurate preoperative diagnosis for pelvic actinomycosis is less than 10%, and symptoms and imaging studies sometimes mimic pelvic malignancy. This report details a case with abdominopelvic actinomycosis associated with an IUD presenting with highly elevated thromboctye count and small bowel perforation with abscess formation.


Subject(s)
Actinomycosis/diagnosis , Intestinal Perforation/diagnosis , Pelvic Inflammatory Disease/diagnosis , Peritonitis/complications , Peritonitis/diagnosis , Thrombocytosis/diagnosis , Actinomycosis/complications , Actinomycosis/microbiology , Actinomycosis/pathology , Female , Humans , Intestinal Perforation/etiology , Intestinal Perforation/pathology , Intrauterine Devices/adverse effects , Middle Aged , Pelvic Inflammatory Disease/complications , Pelvic Inflammatory Disease/microbiology , Pelvic Inflammatory Disease/pathology , Peritonitis/microbiology , Peritonitis/pathology , Thrombocytosis/etiology , Thrombocytosis/pathology
5.
J Formos Med Assoc ; 111(6): 325-32, 2012 Jun.
Article in English | MEDLINE | ID: mdl-22748623

ABSTRACT

BACKGROUND/PURPOSE: The objective of this study was to describe factors associated with bloodstream infections (BSIs) with non-albicans Candida species (NAC), compared with Candida albicans BSIs, and antifungal susceptibility patterns in adult intensive care unit (ICU) patients with chronic renal failure undergoing hemodialysis. To the best of our knowledge, this is the first study to report the potential factors for NAC candidemia in ICU patients with end-stage renal disease on chronic hemodialysis. METHODS: This prospective, observational, multicenter study was conducted in the two centers of Baskent University between January 2007 and July 2010. All adult patients excluding patients with neutropenia, malignancy, glucocorticoid treatment or AIDS, were included. RESULTS: Sixty cases (58.8%) of candidemia were due to C. albicans and 42 (41.2%) to NAC. Multivariate regression analysis revealed that the presence of a central venous catheter was the only risk factor independently associated with BSI due to NAC (p=0.046, odds ratio: 5.90, 95% confidence interval: 1.032-33.717). Mortality was more frequent in those with NAC than C. albicans BSIs (64.3% vs. 55%), but the difference was not significant (p=0.067). Except for two Candida glabrata strains, which were dose-dependently fluconazole susceptible, all Candida species were susceptible to fluconazole, caspofungin, voriconazole and amphotericin B. CONCLUSION: Central venous catheterization was the only factor significantly associated with BSI due to NAC in ICU patients with end-stage renal disease.


Subject(s)
Candida , Candidemia/etiology , Catheter-Related Infections/etiology , Catheterization, Central Venous/adverse effects , Cross Infection/etiology , Kidney Failure, Chronic/complications , Renal Dialysis , Adolescent , Adult , Aged , Aged, 80 and over , Antifungal Agents/pharmacology , Candida/drug effects , Candida/isolation & purification , Candida albicans/drug effects , Candida albicans/isolation & purification , Candidemia/microbiology , Candidemia/mortality , Catheter-Related Infections/microbiology , Catheter-Related Infections/mortality , Cross Infection/microbiology , Cross Infection/mortality , Drug Resistance, Fungal , Female , Humans , Intensive Care Units , Kaplan-Meier Estimate , Kidney Failure, Chronic/mortality , Kidney Failure, Chronic/therapy , Logistic Models , Male , Middle Aged , Multivariate Analysis , Prospective Studies , Risk Factors , Young Adult
8.
Environ Monit Assess ; 171(1-4): 487-91, 2010 Dec.
Article in English | MEDLINE | ID: mdl-20049525

ABSTRACT

We evaluated the in vitro activity of antimicrobial agents against Legionella obtained from hotel and hospital water systems in three different regions of Turkey. Sixty-five Legionella strains (Legionella pneumophila serogroup 6 [n=32], L. pneumophila serogroup 1 [n=27], L. pneumophila serogroup 3 [n=2], and Legionella spp. [n=4]) were tested against levofloxacin, ciprofloxacin, clarithromycin, azithromycin, and rifampicin. The minimum inhibitory concentration (MIC) values of each antimicrobial agent for these strains was determined by the microdilution method using buffered yeast extract medium supplemented with 0.1% ketoglutarate broth. L. pneumophila ATCC 33152, Staphylococcus aureus ATCC 29213, and Escherichia coli ATCC 25922 were used as controls. Minimum inhibitory concentration values were in the following ranges: clarithromycin 0.001-0.5 mg/L, azithromycin 0.001-0.5 mg/L, levofloxacin 0.001-0.5 mg/L, ciprofloxacin 0.001-0.125 mg/L, and rifampicin 0.001- 0.5 mg/L. The MIC(90) for rifampicin, levofloxacin, ciprofloxacin, azithromycin, and clarithromycin were 0.015, 0.125, 0.06, 0.125, and 0.06 mg/L, respectively. To the best of our knowledge, this is the first study to determine in vitro activities of antimicrobial agents against Legionella species in Turkey. Rifampicin had the lowest MIC(90) value. It would seem that azithromycin and clarithromycin exhibit good activity as well as levofloxacin and ciprofloxacin against Legionella isolated from environmental water systems in Turkey.


Subject(s)
Anti-Infective Agents/pharmacology , Legionella pneumophila/drug effects , Water Microbiology , Water Supply , Humans , Legionnaires' Disease/microbiology , Microbial Sensitivity Tests , Turkey
9.
Braz. j. infect. dis ; 13(6): 403-407, Dec. 2009. tab
Article in English | LILACS | ID: lil-546007

ABSTRACT

This prospective case-control study was conducted from October 2003 to June 2007 to evaluate risk factors for multidrug resistance among extended-spectrum-b-lactamase-producing Escherichia coli and Klebsiella spp. (ESBL-EK) isolates in blood cultures. All adult patients (>18 years old) whose blood cultures grew ESBL-EK during the study period were included. An ESBL-EK isolate was defined as MDR if it was resistant to at least one member of following two classes of antibiotics: aminoglycosides (amikacin, gentamicin, or netilmycin) and fluoroquinolones (ofloxacin, or ciprofloxacin). Case patients were those with a MDR ESBL-EK isolate, and control patients were those with a non-MDR ESBL-EK isolate. A total of 94 bloodstream infections, including 37 (39,4 percent) bloodstream infections with ESBL-producing E. coli and 57 (60,6 percent) with ESBL-producing K. pneumoniae,in 86 patients were enrolled. Thirty episodes (31.9 percent) were due to MDR ESBL-EK. The only independent risk factor for MDR ESBL-EK was duration of hospitalization before bacteraemia (OR 3.88; 95 percent CI 1.55-9.71; p=0.004). The rate of multidrug resistance among ESBL-EK bloodstream isolates was high, and duration of hospitalization before bacteraemia was the only indeepended risk factor for the MDR ESBL-EK bloodstream infections.


Subject(s)
Adult , Aged , Female , Humans , Male , Middle Aged , Aminoglycosides/pharmacology , Anti-Bacterial Agents/pharmacology , Drug Resistance, Multiple, Bacterial , Escherichia coli/drug effects , Fluoroquinolones/pharmacology , Klebsiella pneumoniae/drug effects , Bacteremia/microbiology , Case-Control Studies , Cross Infection/microbiology , Escherichia coli Infections/microbiology , Escherichia coli/enzymology , Klebsiella Infections/microbiology , Klebsiella pneumoniae/enzymology , Microbial Sensitivity Tests , Prospective Studies , Risk Factors , beta-Lactamases/biosynthesis
10.
Braz. j. infect. dis ; 13(4): 249-251, Aug. 2009. tab
Article in English | LILACS | ID: lil-539757

ABSTRACT

Oxidative stress can be defined as an increase in oxidants and/or a decrease in antioxidant capacity. We aimed to determine total antioxidant capacity (TAC), total peroxide, malondialdehyde and catalase levels in plasma samples, and calculation of oxidative stress index (OSI) in patients with brucellosis to evaluate their oxidative status using a novel automated method. Sixty-nine patients with brucellosis and 69 healthy control subjects were included in the present study. Plasma levels of total peroxide and malondialdehyde were significantly increased in patients as compared with healthy controls (p<0.001 and p<0.001, respectively). In contrast, TAC level was significantly lower in patients as compared with controls (p<0.001). There was no statistically significant difference between the catalase results of the two groups (p>0.05). OSI level was significantly increased in patients as compared with healthy controls (p<0.001). In conclusion, oxidants were increased and antioxidants were decreased in patients with brucellosis. Oxidative stress was increased in patients with brucellosis.


Subject(s)
Adult , Female , Humans , Male , Middle Aged , Brucellosis/metabolism , Oxidative Stress/physiology , Antioxidants/analysis , Biomarkers/blood , Brucellosis/blood , Case-Control Studies , Catalase/blood , Malondialdehyde/blood , Peroxides/blood
11.
Int J Infect Dis ; 13(6): e485-7, 2009 Nov.
Article in English | MEDLINE | ID: mdl-19398360

ABSTRACT

Brucellosis is a systemic infection involving many organs and tissues. The musculoskeletal system is one of the most commonly affected. The disease can present with sacroiliitis, peripheral arthritis, spondylitis, paraspinal abscess, bursitis, and osteomyelitis. A 25-year-old male patient was admitted with fever of 20-day duration, right-sided hip pain, and night sweating. A Brucella standard tube agglutination test was positive at a titer of 1/160. Magnetic resonance imaging (MRI) of the hip joint showed right sacroiliitis and a hyperintense, nodular, lobulated mass within the right iliacus muscle, consistent with abscess. The patient was started on intramuscular streptomycin at a dose of 1 g/day, oral rifampin 600 mg/day, and doxycycline 200 mg/day. On day 20 of treatment, the patient was admitted with swelling and pain over the left elbow for the past week. MRI of the left elbow was performed, which showed fluid edema suggestive of olecranon bursitis. Taking the patient's complaints into consideration, rifampin and doxycycline treatment were maintained for a year. Pain at the hip joint and elbow resolved and MRI findings disappeared. Abscess of the iliacus muscle, which has not been reported before, and the olecranon bursitis that developed during treatment make this case worth presenting.


Subject(s)
Abdominal Muscles/microbiology , Abscess/microbiology , Arthritis/microbiology , Brucellosis/complications , Bursitis/microbiology , Olecranon Process/microbiology , Sacroiliac Joint/microbiology , Abdominal Muscles/diagnostic imaging , Abscess/diagnostic imaging , Adult , Arthritis/diagnostic imaging , Brucellosis/microbiology , Bursitis/diagnostic imaging , Humans , Magnetic Resonance Imaging , Male , Olecranon Process/diagnostic imaging , Radiography , Sacroiliac Joint/diagnostic imaging
12.
Braz J Infect Dis ; 13(4): 249-51, 2009 Aug.
Article in English | MEDLINE | ID: mdl-20231984

ABSTRACT

Oxidative stress can be defined as an increase in oxidants and/or a decrease in antioxidant capacity. We aimed to determine total antioxidant capacity (TAC), total peroxide, malondialdehyde and catalase levels in plasma samples, and calculation of oxidative stress index (OSI) in patients with brucellosis to evaluate their oxidative status using a novel automated method. Sixty-nine patients with brucellosis and 69 healthy control subjects were included in the present study. Plasma levels of total peroxide and malondialdehyde were significantly increased in patients as compared with healthy controls (p<0.001 and p<0.001, respectively). In contrast, TAC level was significantly lower in patients as compared with controls (p<0.001). There was no statistically significant difference between the catalase results of the two groups (p>0.05). OSI level was significantly increased in patients as compared with healthy controls (p<0.001). In conclusion, oxidants were increased and antioxidants were decreased in patients with brucellosis. Oxidative stress was increased in patients with brucellosis.


Subject(s)
Brucellosis/metabolism , Oxidative Stress/physiology , Adult , Antioxidants/analysis , Biomarkers/blood , Brucellosis/blood , Case-Control Studies , Catalase/blood , Female , Humans , Male , Malondialdehyde/blood , Middle Aged , Peroxides/blood
13.
Braz J Infect Dis ; 13(6): 403-7, 2009 Dec.
Article in English | MEDLINE | ID: mdl-20464329

ABSTRACT

This prospective case-control study was conducted from October 2003 to June 2007 to evaluate risk factors for multidrug resistance among extended-spectrum-b-lactamase-producing Escherichia coli and Klebsiella spp. (ESBL-EK) isolates in blood cultures. All adult patients (>18 years old) whose blood cultures grew ESBL-EK during the study period were included. An ESBL-EK isolate was defined as MDR if it was resistant to at least one member of following two classes of antibiotics: aminoglycosides (amikacin, gentamicin, or netilmycin) and fluoroquinolones (ofloxacin, or ciprofloxacin). Case patients were those with a MDR ESBL-EK isolate, and control patients were those with a non-MDR ESBL-EK isolate. A total of 94 bloodstream infections, including 37 (39,4%) bloodstream infections with ESBL-producing E. coli and 57 (60,6%) with ESBL-producing K. pneumoniae,in 86 patients were enrolled. Thirty episodes (31.9%) were due to MDR ESBL-EK. The only independent risk factor for MDR ESBL-EK was duration of hospitalization before bacteraemia (OR 3.88; 95% CI 1.55-9.71; p=0.004). The rate of multidrug resistance among ESBL-EK bloodstream isolates was high, and duration of hospitalization before bacteraemia was the only indeepended risk factor for the MDR ESBL-EK bloodstream infections.


Subject(s)
Aminoglycosides/pharmacology , Anti-Bacterial Agents/pharmacology , Drug Resistance, Multiple, Bacterial , Escherichia coli/drug effects , Fluoroquinolones/pharmacology , Klebsiella pneumoniae/drug effects , Adult , Aged , Bacteremia/microbiology , Case-Control Studies , Cross Infection/microbiology , Escherichia coli/enzymology , Escherichia coli Infections/microbiology , Female , Humans , Klebsiella Infections/microbiology , Klebsiella pneumoniae/enzymology , Male , Microbial Sensitivity Tests , Middle Aged , Prospective Studies , Risk Factors , beta-Lactamases/biosynthesis
14.
Nephrol Dial Transplant ; 23(7): 2344-9, 2008 Jul.
Article in English | MEDLINE | ID: mdl-18178600

ABSTRACT

BACKGROUND: Patients with brucellosis frequently present with joint and bone pain. However, brucellosis may be overlooked in patients with end-stage renal disease (ESRD) who undergo dialysis since amyloidosis due to renal osteodystrophy and beta-2 microglobulinaemia may cause bone pain as well. Only four cases of end-stage renal failure accompanied by brucellosis have been reported in the literature. We evaluated clinical and laboratory characteristics and organ involvement of seven brucellosis patients with end-stage renal failure and compared them with brucellosis cases without any renal diseases. METHODS: This is a prospective study and involved 158 patients diagnosed with brucellosis. All the patients were divided into two groups: brucellosis patients with ESRD (Group 1) and brucellosis patients without any renal disease (Group 2). RESULTS: Group 1 included 7 patients (5 males and 2 females with the mean age 52.1 +/- 14 years) and Group 2 included 151 patients (62 males and 89 females with the mean age 45.4 +/- 16 years). Out of seven patients in Group 1, one had neurobrucellosis, one had paravertebral abscess, one had epidural abscess and one had peripheral arthritis. In addition, one patient in Group 1 with accompanying sickle cell anaemia presented with pain crisis and was diagnosed with brucellosis on admission. Serological tests were negative for brucellosis, but Brucella melitensis was isolated in blood cultures in another patient with accompanying continuous ambulatory peritoneal dialysis. Group 1 more frequently had joint pain and malaise. B. melitensis was isolated in blood cultures in blood taken in the absence of fever in half of the cases in Group 1 positive for B. melitensis in blood cultures on admission. CONCLUSION: B. melitensis can be isolated in blood cultures even in the absence of high fever. In fact, in the present study, B. melitensis was isolated in most of the cases without high fever. For this reason, blood cultures should be performed in cases of end-stage renal diseases suspected of having brucellosis although fever is not present. In addition, brucellosis can present various clinical forms in endemic areas, mimics several diseases and can be characterized with severe complications.


Subject(s)
Brucella melitensis , Brucellosis/diagnosis , Brucellosis/epidemiology , Kidney Failure, Chronic/microbiology , Adult , Aged , Anti-Bacterial Agents/therapeutic use , Arthralgia/diagnosis , Arthralgia/microbiology , Brucellosis/drug therapy , Diagnosis, Differential , Drug Therapy, Combination , Female , Fever/diagnosis , Fever/microbiology , Humans , Incidence , Kidney Failure, Chronic/therapy , Male , Middle Aged , Prospective Studies , Renal Dialysis , Treatment Outcome , Turkey
15.
Mikrobiyol Bul ; 41(2): 261-9, 2007 Apr.
Article in Turkish | MEDLINE | ID: mdl-17682713

ABSTRACT

Biofilm producing Candida species are known to be more resistant to immune response and antimicrobial agents which leads to treatment failure. The aim of this study was to investigate the biofilm production among Candida species that were isolated from hospitalized patients and to compare the in vitro activities of antifungal agents with biofilm production. A total of 116 Candida spp. (79 C. albicans and 37 non-albicans Candida spp.) isolated from various specimens (blood, sterile body fluids, mucosal and skin lesion samples) were included to the study. Fluconazole, itraconazole, amphotericin B and caspofungin susceptibilities of the isolates were determined by broth microdilution method according to CLSI M27-A2 standards. Biofilm production of Candida spp. was determined by microplate method, using brain heart infusion broth supplemented with 0.25% glucose as a growth medium. Biofilm formation was detected in 33 of 116 isolates (28%) and 11 of them (33%) were the strains isolated from hemocultures. Biofilm production was determined more commonly in blood isolates than the strains isolated from other samples (p < 0.05). The biofilm production rate of non-albicans Candida species (41%) was found higher than C. albicans (23%), which the difference was statistically significant (p < 0.05). Amphotericin B and caspofungin were found the most effective antifungals with the MIC90 values of 0.06 microg/ml and 0.5 microg/ml for C. albicans, and 0.5 microg/ml and 1 microg/ml for non-albicans Candida species respectively. The observed positive correlation between the biofilm production and amphotericin B MIC values were found significant (p < 0.05). In conclusion, high biofilm production rates of Candida species may explain the increase in the rate of catheter-related Candida infections.


Subject(s)
Antifungal Agents/pharmacology , Biofilms/growth & development , Candida/drug effects , Candida/physiology , Candidiasis/microbiology , Fungemia/microbiology , Amphotericin B/pharmacology , Caspofungin , Drug Resistance, Fungal/physiology , Echinocandins/pharmacology , Fluconazole/pharmacology , Humans , Itraconazole/pharmacology , Lipopeptides , Microbial Sensitivity Tests
16.
Int J Antimicrob Agents ; 27(3): 224-8, 2006 Mar.
Article in English | MEDLINE | ID: mdl-16464562

ABSTRACT

The aim of this study was to assess the in vitro activity of a number of non-traditional antibiotics (colistin, azithromycin, doxycycline and rifampicin) against multidrug-resistant (MDR) strains of Pseudomonas aeruginosa and Acinetobacter baumannii isolated from Intensive Care Units (ICUs). We also used the checkerboard method to determine whether combinations of colistin with another non-traditional antibiotic or meropenem act synergistically against these strains. Thirty-five P. aeruginosa and 25 A. baumannii strains that were found to be MDR were included the study. Isolates were collected from the specimens of patients in ICUs from 2001 to 2003. All isolates were identified by standard methods and stored at -20 degrees C until use. Antibiotic powders of azithromycin, doxycycline, rifampicin, meropenem and colistin were obtained from their manufacturers. Minimum inhibitory concentrations (MICs) were determined by the agar dilution method on Mueller-Hinton agar. Five strains of A. baumannii and five strains of P. aeruginosa, all of which had different MIC values for colistin, were selected for the synergy study using the checkerboard titration method. The susceptibility results for doxycycline and meropenem were interpreted according to National Committee for Clinical Laboratory Standards guidelines. The susceptibility breakpoints for colistin and rifampicin were established as 4 mg/L and 2 mg/L, respectively, based on previous studies. Pseudomonas aeruginosa ATCC 27853 and Escherichia coli ATCC 25922 were used as control strains. Testing against the P. aeruginosa strains revealed high MIC50 values for all the drugs except colistin. Doxycycline and colistin were both effective against the A. baumannii strains, with high susceptibility rates of 92% and 100%, respectively. Azithromycin had a high MIC50 value against these strains, whilst rifampicin had a moderate effect (susceptibility rate 64%). The combination of colistin and rifampicin was fully synergistic against four A. baumannii and two P. aeruginosa strains. Combinations of colistin with meropenem and of colistin with azithromycin each showed synergistic activity against three A. baumannii isolates, whilst the same combinations resulted in generally additive or indifferent effects against P. aeruginosa strains. The colistin and doxycycline combination was generally partially synergistic or additive against all the isolates. MDR strains of P. aeruginosa and A. baumannii, which cause nosocomial infections with an increasing ratio in recent years, have limited treatment options. According to our in vitro study results, non-traditional antibiotics such as doxycycline and colistin can be an alternative for the treatment of infections caused by these strains. Combinations of colistin with non-traditional antibiotics or meropenem could be promising alternatives for the treatment of infections due to MDR strains of A. baumannii and P. aeruginosa.


Subject(s)
Acinetobacter Infections/microbiology , Acinetobacter baumannii/drug effects , Anti-Bacterial Agents/therapeutic use , Intensive Care Units , Pseudomonas Infections/microbiology , Pseudomonas aeruginosa/drug effects , Acinetobacter Infections/drug therapy , Acinetobacter baumannii/isolation & purification , Anti-Bacterial Agents/pharmacology , Drug Resistance, Multiple, Bacterial , Drug Synergism , Drug Therapy, Combination , Humans , Microbial Sensitivity Tests , Pseudomonas Infections/drug therapy , Pseudomonas aeruginosa/isolation & purification
17.
J Antimicrob Chemother ; 56(5): 914-8, 2005 Nov.
Article in English | MEDLINE | ID: mdl-16174685

ABSTRACT

OBJECTIVES: To determine the risk factors for community-acquired ciprofloxacin-resistant Escherichia coli urinary tract infection (UTI). METHODS: The study was performed with isolates from community-acquired UTIs collected from 15 centres representing six different geographic regions of Turkey. All microbiological procedures were carried out in a central laboratory. Multivariate analysis was performed for detection of risk factors for resistance. Use of quinolones more than once within the last year, living in a rural area, having a urinary catheter, age >50 and complicated infections were included in the model as variables and logistic regression was performed. RESULTS: A total of 611 gram-negative isolates were studied: 321 were isolated from uncomplicated UTI and 290 were isolated from complicated UTI. E. coli was the causative agent in 90% of the uncomplicated UTIs and in 78% of the complicated UTIs (P < 0.001). Seventeen percent of E. coli strains isolated from uncomplicated cases and 38% of E. coli strains isolated from complicated UTI were found to be resistant to ciprofloxacin. In multivariate analysis, age over 50 [odds ratio (OR): 1.6; confidence interval (CI): 1.08-2.47; P = 0.020], ciprofloxacin use more than once in the last year (OR: 2.8; CI: 1.38-5.47; P = 0.004) and the presence of complicated UTI (OR: 2.4; CI: 1.54-3.61; P < 0.001) were found to be associated with ciprofloxacin resistance. Detection of strains of E. coli producing extended-spectrum beta-lactamase (ESBL) enzymes was two times more common in the patients who received ciprofloxacin than those who did not (15% versus 7.4%). CONCLUSIONS: The increasing prevalence of infections caused by antibiotic-resistant bacteria makes the empirical treatment of UTIs more difficult. One of the important factors contributing to these high resistance rates might be high antibiotic use. Urine culture and antimicrobial susceptibility testing are essential in Turkey for patients with UTI who have risk factors for resistance, such as previous ciprofloxacin use. Fluoroquinolone-sparing agents such as nitrofurantoin and fosfomycin should be evaluated as alternative therapies by further clinical efficacy and safety studies.


Subject(s)
Ciprofloxacin/pharmacology , Drug Resistance, Bacterial , Escherichia coli Infections/microbiology , Escherichia coli/drug effects , Urinary Tract Infections/microbiology , Adolescent , Adult , Age Factors , Aged , Anti-Bacterial Agents/pharmacology , Anti-Bacterial Agents/therapeutic use , Ciprofloxacin/therapeutic use , Community-Acquired Infections/drug therapy , Community-Acquired Infections/microbiology , Escherichia coli/isolation & purification , Escherichia coli Infections/drug therapy , Female , Geography , Humans , Male , Middle Aged , Multivariate Analysis , Risk Factors , Turkey , Urinary Catheterization , Urinary Tract Infections/drug therapy , beta-Lactamases/analysis
20.
Tuberk Toraks ; 51(2): 177-82, 2003.
Article in Turkish | MEDLINE | ID: mdl-15143425

ABSTRACT

To discuss diagnosis, risk factors, clinical and radiologic manifestations of invasive pulmonary aspergillosis (IPA) that is accepted as an important mortality factor in organ transplant recipients. We retrospectively evaluated seven IPA cases who were diagnosed among 207 patients that had undergone organ transplantation surgery in our center between 1998-2001. Of seven patients, four was renal and three was liver recipients. Diagnosis was made histopathologically (three post-mortem, one transbronchial lung biopsy) in four patients while culture positivity (sputum and tracheal aspiration material) with clinical and radiological evaluation was the diagnostic criteria for three patients. The most common respiratory symptoms were fever, productive cough and dyspnea. The most common fiberoptic bronchoscopic findings were mucosal fragility, hemorrhage. In one patient plaque formation was found. One liver recipients had been on hemodialysis because of renal insufficiency (serum creatine was 2.6 mg/dL). All liver and kidney recipients had allograft failure. One liver and two kidney recipients had neutropenia, two liver and one kidney recipients had thrombocytopenia. Six patients had received amphotericin-B and/or itraconazole therapy. Four of the five exitus were receiving antifungal treatment. Three of them were lost in a short time while only one non-survivor had received itraconazole for three weeks. The most frequent CT findings were patchy infiltrations and nodule formation with or without cavitation. Five patients were lost in two months (mortality, 71.4 %), two survivors are under follow up. These findings showed, IPA should be thought in the differential diagnosis of pulmonary infections after organ transplantation.


Subject(s)
Aspergillosis/diagnosis , Lung Diseases, Fungal/diagnosis , Organ Transplantation , Adult , Aspergillosis/diagnostic imaging , Diagnosis, Differential , Female , Humans , Lung Diseases, Fungal/diagnostic imaging , Male , Middle Aged , Radiography
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