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Journal of Medical Microbiology

Cristina Díaz-Ruíz, Beatriz Alonso, Emilia Cercenado, Raquel Cruces, Emilio Bouza, Patricia Muñoz, María Guembe
PURPOSE: The new lipoglycopeptide dalbavancin has only been approved for acute bacterial skin and skin structure infections. However, its alternative use as a catheter lock solution could facilitate the conservative management of catheter-related bloodstream infection. Our objective was to assess the stability and activity of dalbavancin alone and in combination with heparin against methicillin-resistant Staphylococcus aureus (MRSA) and methicillin-resistant Staphylococcus epidermidis (MRSE) biofilms...
May 17, 2018: Journal of Medical Microbiology
Yin-Yin Hu, Cai-Xia Liu, Peng Liu, Zhuo-Ying Wu, Ya-Dong Zhang, Xiao-Shun Xiong, Xiang-Yang Li
PURPOSE: The objective of the current study was to investigate whether hcp plays a role in the process of Acinetobacter baumannii infection and to examine clinically relevant factors that may affect hcp expression. METHODOLOGY: Seventy-seven A. baumannii isolates from patients with a respiratory infection at the Second Affiliated Hospital and Yuying Childrens Hospital of Wenzhou Medical University (Wenzhou, China) were included in this study. PCR was performed to screen for the presence of hcp...
May 17, 2018: Journal of Medical Microbiology
Erika Tång Hallbäck, Nahid Karami, Ingegerd Adlerberth, Sofia Cardew, Maria Ohlén, Hedvig Engström Jakobsson, Liselott Svensson Stadler
Two strains included in a whole-genome sequencing project for methicillin-resistant Staphylococcus aureus (MRSA) were identified as non-Staphylococcus aureus when the sequences were analysed using the bioinformatics software ALEX (, Gothenburg, Sweden). Sequencing of the sodA gene of these strains identified them as Staphylococcus argenteus. The collection of MRSA in western Sweden was checked for additional strains of this species. A total of 18 strains of S. argenteus isolated between 2011 and December 2017 were identified...
May 17, 2018: Journal of Medical Microbiology
José Luis Guzmán-Martín, José María Navarro-Marí, Manuela Expósito-Ruiz, José Gutiérrez-Fernández
We investigated the reliability of nalidixic acid (NA) susceptibility as a marker of ciprofloxacin susceptibility in Salmonella, analysing 302 stool isolates. NC53 of the MicroScan system was used for NA susceptibility tests and the E-test was used for ciprofloxacin susceptibility tests. Among the isolates, 178 (58.9 %) were serogroup B, 74 (24.5 %) were serogroup D, 27 (8.9 %) were serogroup C and 23 (7.6 %) were from other minor serogroups. Globally, susceptibility to NA correctly predicted the susceptibility of Salmonella to ciprofloxacin, with a sensitivity of 81...
May 16, 2018: Journal of Medical Microbiology
Rachna Singh, Anjna Kumari, Karminder Kaur, Parul Sethi, Arunaloke Chakrabarti
The role of penetration limitation in Candida biofilm-associated antifungal resistance remains unclear. Most of the previous work has been done on Candida albicans, although non-albicans (NAC) species are also implicated in invasive candidiasis and the biofilm matrix has been shown to vary amongst different species. Only a few studies have evaluated clinical isolates. This study aimed to determine the relevance of penetration limitation in the antifungal resistance of biofilms formed by C. albicans and NAC clinical isolates, using an agar disk diffusion assay...
May 16, 2018: Journal of Medical Microbiology
Fatemeh Yarian, Bahram Kazemi, Mojgan Bandehpour
PURPOSE: Neisseria meningitidis is the leading global cause of meningitis and sepsis. Detection, followed by identification, of bacterial pathogens is important in medicine and public health. In the present study, we used the ribosome display technique to select single-chain variable fragments (scFv) that are specific to the surface-exposed fHbp antigen of N. meningitidis. METHODOLOGY: The recombinant fHbp protein was used as the antigen for the immunization of BALB/c mice...
May 8, 2018: Journal of Medical Microbiology
Mónica Cerezales, Kyriaki Xanthopoulou, Julia Ertel, Alexandr Nemec, Zulema Bustamante, Harald Seifert, Lucia Gallego, Paul G Higgins
Acinetobacter seifertii is a recently described species that belongs to the Acinetobacter calcoaceticus-Acinetobacter baumannii complex. It has been recovered from clinical samples and is sometimes associated with antimicrobial resistance determinants. We present here the case of three A. seifertii clinical isolates which were initially identified as Acinetobacter sp. by phenotypic methods but no identification at the species level was achieved using semi-automated identification methods. The isolates were further analysed by whole genome sequencing and identified as A...
May 8, 2018: Journal of Medical Microbiology
Nathita Phumthanakorn, Punpichaya Fungwithaya, Pattrarat Chanchaithong, Nuvee Prapasarakul
PURPOSE: This study aimed to detect and identify staphylococcal enterotoxin (SE) genes in methicillin-resistant Staphylococcus pseudintermedius (MRSP) strains from different sources, and to investigate the relationship between their sequence types (STs) and SE gene patterns. METHODOLOGY: The profiles of 17 SE genes in 93 MRSP strains isolated from dogs (n=43), humans (n=18) and the environment (n=32) were detected by PCR. Multilocus sequence typing (MLST), SCCmec typing and pulsed-field gel electrophoresis (PFGE) were used to analyse the clonal relatedness between the molecular type and SE gene profiles...
May 4, 2018: Journal of Medical Microbiology
Daniel Monleón, Alberto Talaya, Estela Giménez, Víctor Vinuesa, José Manuel Morales, Juan Carlos Hernández-Boluda, Ariadna Pérez, José Luis Piñana, Carlos Solano, David Navarro
A plasma metabolomic model obtained by means of untargeted 1 H nuclear magnetic resonance, to which taurine, choline, methylamine, total glutathione, trimethylamine N-oxide, lactate, lysine, isoleucine, total fatty acids and unsaturated fatty acids contributed, was validated for the prediction of first episodes of cytomegalovirus (CMV) DNAaemia in a cohort of 79 allogeneic stem haematopoietic stem cell transplant (allo-HSCT) recipients. The predictive success rate was nearly 65 % for patients at both low and high risk of CMV-related complications according to their baseline characteristics...
May 4, 2018: Journal of Medical Microbiology
Munirah Hishamshah, Norazah Ahmad, Hishamshah Mohd Ibrahim, Nurul Atiqah Nur Halim, Salbiah Nawi, Fairuz Amran
PURPOSE: In this study, we aim to describe and compare the demographical, clinical and laboratory features of leptospirosis and dengue co-infections (LDCI) against single leptospirosis infections in Malaysia. METHODOLOGY: Data of patients admitted to various hospitals in Malaysia from 2011 to 2015 diagnosed with leptospirosis in our laboratory were obtained from their admission records. Co-infection with dengue was determined by collecting dengue serology results...
May 4, 2018: Journal of Medical Microbiology
Maria Cecília Gorla, Juliana Maira Watanabe Pinhata, Ueslei José Dias, Camile de Moraes, Ana Paula Lemos
PURPOSE: To describe the antimicrobial resistance profile of Neisseria meningitidis isolates causing invasive disease in Brazil from 2009 to 2016. METHODOLOGY: Among 3548 N. meningitidis isolates received, 2888 (81.4 %) were analysed for antimicrobial resistance using the broth microdilution technique, as recommended by the Clinical and Laboratory Standards Institute. Isolates were tested for ciprofloxacin, chloramphenicol, ceftriaxone, penicillin G, ampicillin and rifampin...
May 2, 2018: Journal of Medical Microbiology
Diana Machado, Jéssica Antunes, Ana Simões, João Perdigão, Isabel Couto, Matthew McCusker, Marta Martins, Isabel Portugal, Teresa Pacheco, Judite Batista, Cristina Toscano, Miguel Viveiros
PURPOSE: The mechanisms underlying colistin heteroresistance in Acinetobacter baumannii are not fully understood. Here, we investigated the role of efflux in colistin-heteroresistant populations of a multidrug-resistant (MDR) A. baumannii clinical isolate. METHODOLOGY: Three colistin-resistant A. baumannii strain variants isolated from the same clinical sample were studied for the presence of heteroresistance to colistin by drug susceptibility testing, genotyping and drug resistance target mutation analysis...
May 2, 2018: Journal of Medical Microbiology
Anjna Kumari, Sakshi Mankotia, Bhawna Chaubey, Monika Luthra, Rachna Singh
The present study aimed to evaluate the role of biofilm morphology, matrix content and surface hydrophobicity in the biofilm-forming capacity of Candida albicans and non-albicans Candida (NAC) spp. Biofilm formation was determined by microtitre plate assay and bright-field and scanning electron microscopy. The matrix carbohydrates, proteins and e-DNA were quantified by phenol-sulfuric acid, bicinchoninic acid and UV spectroscopy, respectively. Specific glycosyl residues were detected by dot blot. The cell-surface hydrophobicity was determined by hydrocarbon adhesion assay...
May 2, 2018: Journal of Medical Microbiology
Dissou Affolabi, N'Dira Sanoussi, Adelaide Sossou, Tom Nys, Ousman Bodi, Marius Esse, Sabine Houeto, Faridath Massou, Bouke C de Jong, Leen Rigouts
PURPOSE: The aim was to assess the performance of both cetylpyridinium chloride (CPC) and OMNIgene•SPUTUM (OMNI) reagents for the maintenance of Mycobacterium tuberculosis viability in sputum prior to recovery by culture. METHODOLOGY: Using 312 sputa, we evaluated the performance of the two reagents using culture on Löwenstein-Jensen medium after sputum storage in CPC or OMNI for up to 28 days. In addition, the viability of M. tuberculosis isolates stored in both reagents was assessed...
May 2, 2018: Journal of Medical Microbiology
Emmanuel Donbraye, Oluwatayo Israel Olasunkanmi, Babatunde Ayoola Opabode, Temitayo Rachael Ishola, Temitope Oluwasegun Cephas Faleye, Olubusuyi Moses Adewumi, Johnson Adekunle Adeniji
PURPOSE: We recently showed that enteroviruses (EVs) andenterovirus species C (EV-C) in particular were abundant in faecal samples from children who had been diagnosed with acute flaccid paralysis (AFP) in Nigeria but declared to be EV-free by the RD-L20B cell culture-based algorithm. In this study, we investigated whether this observed preponderance of EVs (and EV-Cs) in such samples varies by geographical region. METHODOLOGY: One hundred and eight samples (i.e...
April 30, 2018: Journal of Medical Microbiology
Gemma Jiménez-Guerra, Victor Heras-Cañas, Miguel Gutiérrez-Soto, María Del Pilar Aznarte-Padial, Manuela Expósito-Ruiz, José María Navarro-Marí, José Gutiérrez-Fernández
PURPOSE: Acinetobacter baumannii and Pseudomonas aeruginosa are responsible for numerous nosocomial infections. The objective of this study was to determine the development of their susceptibility to ten antibiotics and the antibiotic consumption of patients with suspicion of urinary tract infection (UTI). METHODOLOGY: A retrospective study was conducted on the susceptibility profiles of A. baumannii and P. aeruginosa isolates from 749 urine samples gathered between January 2013 and December 2016, and on the consumption of imipenem, meropenem and piperacillin-tazobactam between 2014 and 2016...
April 25, 2018: Journal of Medical Microbiology
Lauren A Cowley, Damilola R Oresegun, Marie A Chattaway, Timothy J Dallman, Claire Jenkins
We compared the genomes of 60 isolates of enteroinvasive Escherichia coli (EIEC) in order to better understand the step-wise evolutionary process from non-pathogenic to host-adapted pathogenic E. coli. All isolates belonged to either sequence type (ST) 6, ST99 or ST270. Each ST was located on different branches of the E. coli phylogeny and had invasion plasmids (pINVs) belonging to FII-21 (ST99, ST270), FII-27 (ST270) or FII-28 (ST6, ST270) incompatibility groups. A higher number of insertion sequence (IS) elements were identified in ST6 and ST270 than in ST99, and appeared to be driving the loss of functional genes...
April 25, 2018: Journal of Medical Microbiology
Franka Lestin-Bernstein, Marc Tietke, Lutz Briedigkeit, Oliver Heese
PURPOSE: Spondylodiscitis as a rare disease has increased in recent years; there are only a few recommendations regarding the diagnostics and treatment. The objective of this retrospective study was to characterise these patients and identify factors for a favourable healing process - with an emphasis on antibiotic therapy. METHODOLOGY: Findings/treatment regimens for all patients with spondylodiscitis treated at a tertiary care hospital in 2012/2013 were recorded...
April 23, 2018: Journal of Medical Microbiology
Juliana Maira Watanabe Pinhata, Isis Moreira Felippe, Juliana Failde Gallo, Erica Chimara, Lucilaine Ferrazoli, Rosangela Siqueira de Oliveira
We evaluated the microscopic and macroscopic characteristics of mycobacteria growth indicator tube (MGIT) cultures for the presumptive identification of the Mycobacterium tuberculosis complex (MTBC) and assessed the reliability of this strategy for correctly directing isolates to drug susceptibility testing (DST) or species identification. A total of 1526 isolates of mycobacteria received at the Instituto Adolfo Lutz were prospectively subjected to presumptive identification by the observation of growth characteristics along with cord formation detection via microscopy...
April 23, 2018: Journal of Medical Microbiology
Li Yuan, Ya-Jun Zhai, Hua Wu, Hua-Run Sun, Zhi-Pei He, Ya-Bin Wang, Yu-Shan Pan, Nan-Nan Kuang, Gong-Zheng Hu
PURPOSE: The resistance/nodulation/cell division (RND) family multidrug efflux pump, OqxAB, has been identified as one of the leading mechanisms of plasmid-mediated quinolone resistance and has become increasingly prevalent among Enterobacteriaceae in recent years. However, oqxAB genes have not yet been reported in Enterococcus isolates. The aim of the present study was to identify the oqxAB genes and investigate their prevalence among Enterococcus from swine manure in China. METHODOLOGY: The oqxAB genes were screened in 87 Enterococcus isolates by PCR...
April 23, 2018: Journal of Medical Microbiology
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