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https://www.readbyqxmd.com/read/28439301/prevalence-virulence-potential-and-pulsed-field-gel-electrophoresis-profiling-of-shiga-toxin-producing-escherichia-coli-strains-from-cattle
#1
Hee-Jin Dong, Soomin Lee, Woohyun Kim, Jae-Uk An, Junhyung Kim, Danil Kim, Seongbeom Cho
BACKGROUND: As a primary source of Shiga-toxin-producing Escherichia coli (STEC) infection, cattle are often targeted to develop strategies for reducing STEC contamination. Monitoring the virulence potentials of STEC isolates from cattle is important for tracing contamination sources, managing outbreaks or sporadic cases, and reducing the risks for human infection. This study aimed to investigate the prevalence of STEC in cattle farm samples in South Korea and to assess their virulence potentials...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28437230/high-diversity-of-antimicrobial-resistance-genes-class-1-integrons-and-genotypes-of-multidrug-resistant-escherichia-coli-in-beef-carcasses
#2
Chih-Ming Chen, Se-Chin Ke, Chia-Ru Li, Ying-Chen Wu, Ter-Hsin Chen, Chih-Ho Lai, Xin-Xia Wu, Lii-Tzu Wu
Multidrug-resistant Escherichia coli can contaminate food meat during processing and cause human infection. Phenotypic and genotypic characterization of the antimicrobial resistance were conducted for 45 multidrug-resistant E. coli isolates from 208 samples of beef carcasses. The mechanisms of resistance were evaluated using polymerase chain reaction and sequencing methods, and the clonal relationship among isolates was evaluated using multilocus sequence typing (MLST) and pulsed-field gel electrophoresis (PFGE)...
February 23, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28435821/utilization-of-pfge-as-a-powerful-discriminative-tool-for-the-investigation-of-genetic-diversity-among-mrsa-strains
#3
Solmaz Ohadian Moghadam, Mohammad Reza Pourmand, Masoumeh Douraghi, Samira Sabzi, Parisa Ghaffari
BACKGROUND: Methicillin-resistant Staphylococcus aureus (MRSA) is a significant challenge to the burn patient. The implementation of proper monitoring programs and prompt identification of epidemic MRSA strains are critical to consequently control and eradicate potential outbreaks. This study aimed to define the genetic relatedness of MRSA strains isolated from burn patients by analyzing the large fragments of DNA. METHODS: In this cross-sectional study, 126 pus/wound swabs from skin and soft tissue infections (SSTIs) were collected from inpatients of Shahid Motahari Burn Center (Tehran, Iran) in 2013...
March 2017: Iranian Journal of Public Health
https://www.readbyqxmd.com/read/28433796/genetic-diversity-and-virulence-genes-of-salmonella-enterica-subspecies-enterica-serotype-enteritidis-isolated-from-meats-and-eggs
#4
Fatemeh Fardsanei, Mohammad Mehdi Soltan Dallal, Masoumeh Douraghi, Taghi Zahraei Salehi, Mahmood Mahmoodi, Hamed Memariani, Farhad Nikkhahi
Salmonella enterica subspecies enterica serotype Enteritidis (S. Enteritidis) is one of the leading causes of food-borne gastroenteritis associated with the consumption of contaminated food products of animal origin. Little is known about the genetic diversity and virulence content of S. Enteritidis isolated from poultry meats and eggs in Iran. A total of 34 S. Enteritidis strains were collected from different food sources of animal origin in Tehran from May 2015 to July 2016. All of the S. Enteritidis strains were serotyped, antimicrobial susceptibility tested, and characterized for virulence genes...
April 19, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28428772/molecular-characterization-of-staphylococcus-aureus-isolated-from-bovine-mastitis-and-close-human-contacts-in-south-african-dairy-herds-genetic-diversity-and-inter-species-host-transmission
#5
Tracy Schmidt, Marleen M Kock, Marthie M Ehlers
Staphylococcus aureus is one of the most common etiological agents of contagious bovine mastitis worldwide. The purpose of this study was to genetically characterize a collection of S. aureus isolates (bovine = 146, human = 12) recovered from cases of bovine mastitis and nasal swabs of close human contacts in the dairy environment. Isolates were screened for a combination of clinically significant antimicrobial and virulence gene markers whilst the molecular epidemiology of these isolates and possible inter-species host transmission was investigated using a combination of genotyping techniques...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28427842/predominance-of-international-clone-2-oxa-23-producing-acinetobacter-baumannii-clinical-isolates-in-greece-2015-results-of-a-nationwide-study
#6
Spyros Pournaras, Konstantina Dafopoulou, Mariateresa Del Franco, Olympia Zarkotou, Evangelia Dimitroulia, Efi Protonotariou, Aggeliki Poulou, Raffaele Zarrilli, Athanasios Tsakris
In a previous nationwide study in Greece, OXA-58 was the sole carbapenemase present among carbapenem-resistant Acinetobacter baumannii (CRAB) isolated between 2000 and 2009. In this study, the antibiotic resistances, carbapenemase gene content and clonal relatedness of 194 single-patient CRAB clinical isolates collected randomly during 2015 from 11 tertiary hospitals located throughout Greece were investigated. Antimicrobial susceptibility was determined using commercial and dilution methods. PCR for carbapenemase genes were performed...
April 18, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28414572/molecular-characterization-of-fluoroquinolone-resistant-haemophilus-parainfluenzae-clinical-isolates-in-spain
#7
Inmaculada López-Hernández, Jesús Machuca, Paula Díaz de Alba, Carolina Sarvisé, Frederic Gómez, José Manuel Rodríguez-Martínez, Alvaro Pascual
OBJECTIVE: The objective was to characterize a group of clinical isolates of fluoroquinolone-resistant Haemophilus parainfluenzae collected in Northern Spain (March-December 2014). METHODS: Twelve clinical isolates of H. parainfluenzae were studied by performing antimicrobial susceptibility testing and PCR amplification and nucleotide sequencing of the QRDR (quinolone resistance-determining region) of gyrA, parC, gyrB, and parE genes. Screening for plasmid-mediated quinolone resistance (PMQR) was also studied...
April 17, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28407796/prevalence-of-methicillin-resistant-staphylococcus-aureus-mrsa-infection-and-the-molecular-characteristics-of-mrsa-bacteraemia-over-a-two-year-period-in-a-tertiary-teaching-hospital-in-malaysia
#8
Pik San Sit, Cindy Shuan Ju Teh, Nuryana Idris, I-Ching Sam, Sharifah Faridah Syed Omar, Helmi Sulaiman, Kwai Lin Thong, Adeeba Kamarulzaman, Sasheela Ponnampalavanar
BACKGROUND: Methicillin-resistant Staphylococcus aureus (MRSA) is an established pathogen that causes hospital- and community-acquired infections worldwide. The prevalence rate of MRSA infections were reported to be the highest in Asia. As there is limited epidemiological study being done in Malaysia, this study aimed to determine the prevalence of MRSA infection and the molecular characteristics of MRSA bacteraemia. METHODS: Two hundred and nine MRSA strains from year 2011 to 2012 were collected from a tertiary teaching hospital in Malaysia...
April 13, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28404677/comparison-of-two-whole-genome-sequencing-methods-for-analysis-of-three-methicillin-resistant-staphylococcus-aureus-outbreaks
#9
Scott A Cunningham, Nicholas Chia, Patricio R Jeraldo, Daniel J Quest, Julie A Johnson, Dave J Boxrud, Angela J Taylor, Jun Chen, Gregory D Jenkins, Travis M Drucker, Heidi Nelson, Robin Patel
Whole genome sequencing (WGS) can provide excellent resolution in global and local epidemiological investigations of Staphylococcus aureus outbreaks. A variety of sequencing approaches and analytical tools have been used; it is not clear which is ideal. We compared two WGS strategies and two analytical approaches to the standard method of SmaI restriction digestion pulsed-field gel electrophoresis (PFGE) for typing S. aureus Forty-two S. aureus isolates from three outbreaks and 12 reference isolates were studied...
April 12, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28400018/reassessment-of-cronobacter-spp-originally-isolated-as-enterobacter-sakazakii-from-infant-food
#10
Ömer Akineden, Vanessa Heinrich, Madeleine Gross, Ewald Usleber
Cronobacter spp. cause infant disease, several cases have been associated with powdered infant formulae (PIF). In the early 2000s, contamination of German PIF with these opportunistic pathogens was quite common. Before 2008, all isolates Cronobacter spp. had been classified as Enterobacter sakazakii, therefore little is known about species diversity within such isolates. Genetic, serologic, and biochemical traits of 80 Cronobacter isolates, originally obtained 2003-2006 within infant food surveys in Germany, were reassessed in this study...
August 2017: Food Microbiology
https://www.readbyqxmd.com/read/28400002/salmonella-weltevreden-in-integrated-and-non-integrated-tilapia-aquaculture-systems-in-guangdong-china
#11
Kang Li, Gitte Petersen, Lisa Barco, Kristian Hvidtfeldt, Liping Liu, Anders Dalsgaard
Integrated tilapia-pig farming, which uses manure from pigs as fertilizers in fish pond, is a traditional and common production system practised by small-scale farmers in South-east Asia. Although such systems may be environmentally sustainable, they also pose potential food safety hazards including transmission of faecal zoonotic pathogens and accumulation of antimicrobial and other chemical residues. This study aimed to determine differences in occurrence and characteristics of Salmonella spp. isolated from tilapia-pig and non-integrated aquaculture systems in Guangdong province, China...
August 2017: Food Microbiology
https://www.readbyqxmd.com/read/28400001/campylobacter-jejuni-survival-in-a-poultry-processing-plant-environment
#12
Lourdes García-Sánchez, Beatriz Melero, Isabel Jaime, Marja-Liisa Hänninen, Mirko Rossi, Jordi Rovira
Campylobacteriosis is the most common cause of bacterial gastroenteritis worldwide. Consumption of poultry, especially chicken's meat is considered the most common route for human infection. The aim of this study was to determine if Campylobacter spp. might persist in the poultry plant environment before and after cleaning and disinfection procedures and the distribution and their genetic relatedness. During one month from a poultry plant were analyzed a total of 494 samples -defeathering machine, evisceration machine, floor, sink, conveyor belt, shackles and broiler meat- in order to isolate C...
August 2017: Food Microbiology
https://www.readbyqxmd.com/read/28399856/factors-associated-with-staphylococcus-aureus-nasal-carriage-and-molecular-characteristics-among-the-general-population-at-a-medical-college-campus-in-guangzhou-south-china
#13
B J Chen, X Y Xie, L J Ni, X L Dai, Y Lu, X Q Wu, H Y Li, Y D Yao, S Y Huang
BACKGROUND: The nasal cavity is the main colonization site of Staphylococcus aureus (S. aureus) in human body. Nasal carriage may be a strong risk factor for some serious infection. There was still limited information about the nasal carriage for S. aureus in south China. METHODS: Sought to determine the prevalence and molecular characteristics of S. aureus nasal carriage, 295 volunteers residing on a medicine campus were investigated and sampled the nasal cavity swab...
April 11, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28397465/variation-of-housekeeping-genes-in-clinical-isolates-and-vaccine-strains-of-bordetella-pertussis
#14
Masoumeh Fathi, Faezeh Haghighi, Fereshteh Shahcheraghi, Ebrahim Abbasi, Seyed Saeed Eshraghi, Sedighe Ghourchian, Hojjat Zeraati, Mehdi Yaseri, Masoumeh Douraghi, Fazel Shokri
BACKGROUND: Bordetella pertussis causes serious contagious infections, primarily in childhood. A whole-cell vaccine, diphtheria-tetanus-whole cell pertussis (DTwP), has been used to protect against pertussis in children in Iran, but the pertussis cases have been increasing during recent years. We determined the allelic variation level of housekeeping genes in isolates recovered from pertussis patients and vaccine strains used in national vaccination program. METHODS: Five clinical isolates, 2 vaccine strains and a Tohama I strain were studied through multilocus sequence typing (MLST) of housekeeping genes...
April 1, 2017: Clinical Laboratory
https://www.readbyqxmd.com/read/28388651/tigecycline-resistance-among-carbapenem-resistant-klebsiella-pneumoniae-clinical-characteristics-and-expression-levels-of-efflux-pump-genes
#15
Sheng-Kang Chiu, Ming-Chin Chan, Li-Yueh Huang, Yi-Tsung Lin, Jung-Chung Lin, Po-Liang Lu, L Kristopher Siu, Feng-Yee Chang, Kuo-Ming Yeh
OBJECTIVES: Tigecycline is a treatment option for infections caused by carbapenem-resistant Klebsiella pneumoniae (CRKP). Emerging tigecycline resistance in CRKP represents a growing threat. Knowledge of the clinical, microbiological, and molecular characteristics of tigecycline- and carbapenem-resistant Klebsiella pneumoniae (TCRKP) is limited. METHODS: Patients infected with TCRKP were identified from a Taiwanese national surveillance study. Clinical data were collected from medical records...
2017: PloS One
https://www.readbyqxmd.com/read/28384861/molecular-characterization-of-multidrug-resistant-strains-of-acinetobacter-baumannii-isolated-from-intensive-care-units-in-west-of-iran
#16
Parviz Mohajeri, Abbas Farahani, Rasa Sheini Mehrabzadeh
INTRODUCTION: According to the results of various studies using phenotypic methods, the prevalence of Multidrug Resistant (MDR) Acinetobacter baumannii (A. baumannii) isolates has been increasing worldwide. Pulsed-Field Gel Electrophoresis (PFGE) technique is known as the gold standard method to determine clonal characterization of bacterial species, especially A. baumannii. AIM: To determine the clonal relatedness and investigate the prevalence of integron classes 1 and 2 and genes encoding OXA-23 and 24 in A...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28379732/prevalence-of-plasmid-mediated-fosfomycin-resistance-gene-fosa3-among-ctx-m-producing-escherichia-coli-isolates-from-chickens-in-china
#17
Wei Jiang, Shuai Men, Linghan Kong, Suzhen Ma, Yongqiang Yang, Yongxiang Wang, Qiwu Yuan, Guangyang Cheng, Wencheng Zou, Hongning Wang
The aim of this study was to investigate the prevalence of fosfomycin resistance gene fosA3 and characterize plasmids harboring fosA3 among CTX-M-producing Escherichia coli from chickens in China. A total of 234 CTX-M-producing E. coli isolates collected from chickens from 2014 to 2016 were screened for the presence of plasmid-mediated fosfomycin resistance genes (fosA, fosA3, and fosC2). Clonal relatedness of fosA3-positive isolates was determined by pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST)...
April 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/28378066/genetic-background-of-%C3%AE-lactamases-in-enterobacteriaceae-isolates-from-environmental-samples
#18
Daniele V de Oliveira, Luciana S Nunes, Afonso Luís Barth, Sueli T Van Der Sand
The prevalence of β-lactamase-producing Enterobacteriaceae has increased worldwide. Although antibiotic-resistant bacteria are usually associated with hospitals, there are a growing number of reports of resistant bacteria in other environments. Concern about resistant microorganisms outside the hospital setting highlights the need to investigate mechanisms of antibiotic resistance in isolates collected from the environment. The present study evaluated the resistance mechanism to β-lactam antibiotics in 40 isolates from hospital sewage and surface water from the Dilúvio Stream, Porto Alegre City, Southern Brazil...
April 4, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28376809/molecular-characterization-of-penicillin-non-susceptible-streptococcus-pneumoniae-isolated-before-and-after-pneumococcal-conjugate-vaccine-implementation-in-casablanca-morocco
#19
Idrissa Diawara, Abouddihaj Barguigua, Khalid Katfy, Kaotar Nayme, Houria Belabbes, Mohammed Timinouni, Khalid Zerouali, Naima Elmdaghri
BACKGROUND: Streptococcus pneumoniae is a major cause of morbidity and mortality worldwide, especially among children and the elderly. The ability to effectively treat pneumococcal infection has been compromised due to the acquisition of antibiotic resistance, particularly to β-lactam drugs. This study aimed to describe the prevalence and molecular evolution of penicillin non-susceptible S. pneumoniae (PNSP) isolated from invasive diseases before and after pneumococcal conjugate vaccine implementation in Casablanca, Morocco...
April 4, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28375698/extended-spectrum-%C3%AE-lactamase-producing-klebsiella-pneumoniae-from-pharmaceutical-wastewaters-in-south-western-nigeria
#20
Avemaria Obasi, SimonCyril Nwachukwu, Esther Ugoji, Christian Kohler, André Göhler, Veronica Balau, Yvonne Pfeifer, Ivo Steinmetz
Emergence and spread of Klebsiella pneumoniae isolates producing extended-spectrum β-lactamases (ESBLs) present a major threat to public health. In this study, we characterized β-lactam-resistant K. pneumoniae isolates from six wastewater samples obtained from two pharmaceutical industries located in Lagos and Ogun States, Nigeria. Bacteria were isolated by using MacConkey agar; species identification and antibacterial susceptibility testing were performed by Vitek 2. Etest was used for ESBL phenotype confirmation...
April 4, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
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