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Mark A Toleman
No abstract text is available yet for this article.
March 2017: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
Windy D Tanner, Robyn M Atkinson, Ramesh K Goel, Mark A Toleman, Lowell Scott Benson, Christina A Porucznik, James A VanDerslice
Horizontal gene transfer has contributed to the global spread of the blaNDM-1 gene. Multiple studies have demonstrated plasmid transfer of blaNDM-1 between Gram-negative bacteria, primarily Enterobacteriaceae species, but conjugational transfer of natural blaNDM-1 plasmids from Enterobacteriaceae into Pseudomonas aeruginosa and Acinetobacter baumannii has not previously been shown. As P. aeruginosa and A. baumannii are both typically strong biofilm formers, transfer of natural blaNDM-1 plasmids could potentially occur more readily in this environment...
April 1, 2017: FEMS Microbiology Letters
Sam Abraham, David Jordan, Hui S Wong, James R Johnson, Mark A Toleman, David L Wakeham, David M Gordon, John D Turnidge, Joanne L Mollinger, Justine S Gibson, Darren J Trott
This study aimed to define the frequency of resistance to critically important antimicrobials (CIAs) [i.e. extended-spectrum cephalosporins (ESCs), fluoroquinolones (FQs) and carbapenems] among Escherichia coli isolates causing clinical disease in Australian food-producing animals. Clinical E. coli isolates (n=324) from Australian food-producing animals [cattle (n=169), porcine (n=114), poultry (n=32) and sheep (n=9)] were compiled from all veterinary diagnostic laboratories across Australia over a 1-year period...
December 2015: Journal of Global Antimicrobial Resistance
Anna Rita Liuzzi, Ann Kift-Morgan, Melisa Lopez-Anton, Ida M Friberg, Jingjing Zhang, Amy C Brook, Gareth W Roberts, Kieron L Donovan, Chantal S Colmont, Mark A Toleman, Timothy Bowen, David W Johnson, Nicholas Topley, Bernhard Moser, Donald J Fraser, Matthias Eberl
The antimicrobial responsiveness and function of unconventional human T cells are poorly understood, with only limited access to relevant specimens from sites of infection. Peritonitis is a common and serious complication in individuals with end-stage kidney disease receiving peritoneal dialysis. By analyzing local and systemic immune responses in peritoneal dialysis patients presenting with acute bacterial peritonitis and monitoring individuals before and during defined infectious episodes, our data show that Vγ9/Vδ2(+) γδ T cells and mucosal-associated invariant T cells accumulate at the site of infection with organisms producing (E)-4-hydroxy-3-methyl-but-2-enyl pyrophosphate and vitamin B2, respectively...
September 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
Michelle S Toleman, Sandra Reuter, Francesc Coll, Ewan M Harrison, Beth Blane, Nicholas M Brown, M Estée Török, Julian Parkhill, Sharon J Peacock
BACKGROUND: The spread of USA300 methicillin-resistant Staphylococcus aureus (MRSA) across the United States resulted in an epidemic of infections. In Europe, only sporadic cases or small clusters of USA300 infections are described, and its prevalence in England is unknown. We conducted prospective surveillance for USA300 in the east of England. METHODS: We undertook a 12-month prospective observational cohort study of all individuals with MRSA isolated from community and hospital samples submitted to a microbiology laboratory...
August 1, 2016: Journal of Infectious Diseases
J M Tyrrell, M Wootton, M A Toleman, R A Howe, M Woodward, T R Walsh
CTX-M genes are the most prevalent ESBL globally, infiltrating nosocomial, community and environmental settings. Wild and domesticated animals may act as effective vectors for the dissemination of CTX-producing Enterobacteriaceae. This study aimed to contextualise blaCTX-M-14-positive, cephalosporin-resistant Enterobacteriaceae human infections and compared resistance and pathogenicity markers with veterinary isolates. Epidemiologically related human (n=18) and veterinary (n=4) blaCTX-M-14-positive E. coli were fully characterised...
April 15, 2016: Veterinary Microbiology
Michelle S Toleman, Katharine Herbert, Noel McCarthy, David N Church
PURPOSE: Despite substantial morbidity and mortality of influenza and pneumococcal infections in cancer patients treated with chemotherapy, vaccination against both illnesses is infrequent. We evaluated the impact of implementation of clinical guidelines on vaccination of chemotherapy patients treated in our institute. METHODS: We performed a prospective audit before (2012) and after (2013-2014) the introduction of immunisation guidelines for chemotherapy patients in a UK tertiary cancer centre...
May 2016: Supportive Care in Cancer: Official Journal of the Multinational Association of Supportive Care in Cancer
Michelle S Toleman, I Barry Vipond, Richard Brindle
It is often difficult to obtain a bacteriological diagnosis in patients with cellulitis. We examined the utility of molecular techniques and skin and throat cultures, as well as serology, in providing evidence of either Staphylococcus aureus or group A Streptococcus (GAS) presence inpatients with cellulitis. Samples were collected from patients with a clinical diagnosis of cellulitis who were recruited into a prospective placebo-controlled clinical trial (C4C study, EudraCT 2013-001218-14). Specific PCR, paired serology and culture for both organisms were carried out on a variety of samples where appropriate...
January 2016: Journal of Medical Microbiology
Mark A Toleman, Joachim J Bugert, Syed A Nizam
Carriage of the New Delhi metallo-β-lactamase variant 1 (NDM-1) enables drug resistance to move between communities and hospitals. In Bangladesh, we found the blaNDM-1 gene in 62% of environmental waters and in fermentative and nonfermentative gram-negative bacteria. Escherichia coli sequence type (ST) 101 was most commonly found, reflecting a common global relationship between ST101 and NDM-1.
June 2015: Emerging Infectious Diseases
Ali F Aboklaish, Emilie Dordet-Frisoni, Christine Citti, Mark A Toleman, John I Glass, O Brad Spiller
While transposon mutagenesis has been successfully used for Mycoplasma spp. to disrupt and determine non-essential genes, previous attempts with Ureaplasma spp. have been unsuccessful. Using a polyethylene glycol-transformation enhancing protocol, we were able to transform three separate serovars of Ureaplasma parvum with a Tn4001-based mini-transposon plasmid containing a gentamicin resistance selection marker. Despite the large degree of homology between Ureaplasma parvum and Ureaplasma urealyticum, all attempts to transform the latter in parallel failed, with the exception of a single clinical U...
November 2014: International Journal of Medical Microbiology: IJMM
Lim S Jones, Maria J Carvalho, Mark A Toleman, P Lewis White, Thomas R Connor, Ammara Mushtaq, Janis L Weeks, Karthikeyan K Kumarasamy, Katherine E Raven, M Estée Török, Sharon J Peacock, Robin A Howe, Timothy R Walsh
The blaNDM-1 gene is associated with extensive drug resistance in Gram-negative bacteria. This probably spread to Enterobacteriaceae from Acinetobacter spp., and we characterized plasmids associated with blaNDM-1 in Acinetobacter spp. to gain insight into their role in this dissemination. Four clinical NDM-1-producing Acinetobacter species strains from India and Pakistan were investigated. A plasmid harboring blaNDM-1, pNDM-40-1, was characterized by whole-genome sequencing of Acinetobacter bereziniae CHI-40-1 and comparison with related plasmids...
February 2015: Antimicrobial Agents and Chemotherapy
Lim S Jones, Mark A Toleman, Janis L Weeks, Robin A Howe, Timothy R Walsh, Karthikeyan K Kumarasamy
NDM-1 probably emerged in Acinetobacter species prior to its dissemination among Enterobacteriaceae, and NDM-1-like enzymes are increasingly reported in Acinetobacter species. Here, we report on the genetic context of blaNDM-1 in the earliest known NDM-1-producing organisms, clinical isolates of Acinetobacter from India in 2005. These strains harbor blaNDM-1 plasmids of different sizes. The gene is associated with the remnants of the Tn125 transposon normally associated with blaNDM-1 in Acinetobacter spp. The transposon has been disrupted by the IS26 insertion and subsequent movement events...
July 2014: Antimicrobial Agents and Chemotherapy
Mark Toleman
No abstract text is available yet for this article.
February 2014: Journal of Infection and Public Health
Andreas F Wendel, Alexander H B Brodner, Stephan Wydra, Sofija Ressina, Birgit Henrich, Klaus Pfeffer, Mark A Toleman, Colin R Mackenzie
Since the first isolation in 2002, the metallo-β-lactamase GIM-1 has not been detected outside Germany. The data presented here, for 50 clinical blaGIM-1-positive isolates, including Pseudomonas spp. and Enterobacteriaceae (Enterobacter cloacae, Klebsiella oxytoca, Serratia marcescens, Escherichia coli, and Citrobacter freundii), collected between 2007 and 2012 at the original site in an ongoing outbreak, demonstrate a diverse genetic background and dissemination of the gene conferring resistance to enteric bacteria...
October 2013: Antimicrobial Agents and Chemotherapy
Mikhail V Edelstein, Elena N Skleenova, Oksana V Shevchenko, Jimson W D'souza, Dmitry V Tapalski, Ilya S Azizov, Marina V Sukhorukova, Roman A Pavlukov, Roman S Kozlov, Mark A Toleman, Timothy R Walsh
BACKGROUND: Multidrug-resistant and extensively-drug-resistant Pseudomonas aeruginosa are increasing therapeutic challenges worldwide. We did a longitudinal epidemiological and clinical study of extensively-drug-resistant P aeruginosa in Belarus, Kazakhstan, and Russia. METHODS: The study was done in three prospectively defined phases: Jan 1, 2002-Dec 31, 2004; Jan 1, 2006-Dec 31, 2007; and Jan 1, 2008-Dec 31, 2010. The first two phases were in Russia only. All consecutive, non-duplicate, nosocomial isolates and case report forms were sent to the coordinating centre (Institute of Antimicrobial Chemotherapy, Smolensk, Russia), where species reidentification, susceptibility testing, and molecular typing of isolates were done...
October 2013: Lancet Infectious Diseases
Sara Domingues, Mark A Toleman, Kaare M Nielsen, Gabriela J da Silva
Miniature inverted repeat transposable elements (MITEs) have been identified flanking class 1 integrons. We have identified and characterized a 439-bp MITE-like structure in seven Acinetobacter species isolates from Portugal and Brazil. The complete sequence similarity of the elements and flanking regions suggests that MITEs may act as mobilizable vectors for the dissemination of integrons.
July 2013: Journal of Clinical Microbiology
Dongeun Yong, Mark A Toleman, Jan Bell, Brett Ritchie, Rachael Pratt, Henry Ryley, Timothy R Walsh
Three clinical Pseudomonas aeruginosa isolates (WCH2677, WCH2813, and WCH2837) isolated from the Women's and Children's Hospital, Adelaide, Australia, produced a metallo-β-lactamase (MBL)-positive Etest result. All isolates were PCR negative for known MBL genes. A gene bank was created, and an MBL gene, designated bla(AIM-1), was cloned and fully characterized. The encoded enzyme, AIM-1, is a group B3 MBL that has the highest level of identity to THIN-B and L1. It is chromosomal and flanked by two copies (one intact and one truncated) of an ISCR element, ISCR15...
December 2012: Antimicrobial Agents and Chemotherapy
Christian G Giske, Inga Fröding, Chowdhury Mehedi Hasan, Agata Turlej-Rogacka, Mark Toleman, David Livermore, Neil Woodford, Timothy R Walsh
Clinical isolates of Klebsiella pneumoniae producing NDM-1 carbapenemase from India (n = 22), the United Kingdom (n = 13), and Sweden (n = 4) were subjected to multilocus sequence typing (MLST), automated repetitive sequence-based PCR (rep-PCR), serotyping, virulence gene screening, and plasmid replicon typing. The most frequently detected MLST sequence types (STs) were ST14 (n = 13; all serotype K2), ST11, ST149, ST231, and ST147. The correlation between MLST and automated rep-PCR was excellent. IncA/C was the most frequently detected plasmid replicon type (n = 14)...
May 2012: Antimicrobial Agents and Chemotherapy
M A Toleman, J Spencer, L Jones, T R Walsh
Alignment of DNA sequences found upstream of aphA6 and all bla(NDM-1) genes displays 100% identity. This identity continues 19 bp into the bla(NDM-1) gene such that the first 6 amino acids of aphA6 and bla(NDM-1) are the same. Furthermore, the percent GC content (GC%) of aphA6 is considerably lower than that of bla(NDM-1) and the GC% within the bla(NDM-1) structural gene changes dramatically after the first 19 bp. This is unequivocal evidence that bla(NDM-1) is a chimera.
May 2012: Antimicrobial Agents and Chemotherapy
Allaaeddin El Salabi, Pardha Saradhi Borra, Mark A Toleman, Ørjan Samuelsen, Timothy R Walsh
An Achromobacter xylosoxidans strain from the Tripoli central hospital produced a unique metallo-β-lactamase, designated TMB-1, which is related to DIM-1 (62%) and GIM-1 (51%). bla(TMB-1) was embedded in a class 1 integron and located on the chromosome. The TMB-1 β-lactamase has lower k(cat) values than both DIM-1 and GIM-1 with cephalosporins and carbapenems. The K(m) values were more similar to those of GIM-1 than those of DIM-1, with the overall k(cat)/K(m) values being lower than those for GIM-1 and DIM-1...
May 2012: Antimicrobial Agents and Chemotherapy
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