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4. Novel allelic variants of blaOXA-48-likecarried on IncN2and IncC2plasmids isolated from clinical cases in Argentina: In vivoemergence of blaOXA-567

Author

de Mendieta, Juan Manuel, De Belder, Denise, Tijet, Nathalie, Ghiglione, Barbara, Melano, Roberto G., Rapoport, Melina, Power, Pablo, Di Bella, Adriana, Biondi, Estefanía, Pasterán, Fernando, Corso, Alejandra, and Gomez, Sonia A.

Abstract

•Carbapenem-resistant Escherichia coliST1196 and Klebsiella pneumoniaeST6838 were isolated from paediatric patients.•OXA-438 and OXA-567 were found to be novel variants derived from the OXA-48-like group of enzymes.•The new oxaenzymes were located in IncN2and IncC2conjugative plasmids.•The close genetic environment of blaOXA-438and blaOXA-567suggests a common origin.•blaOXA-567emerged during co-colonisation in vivowith blaOXA-163K. pneumoniae.

Published
2025
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6. Co-integrate Col3m bla NDM-1 -harboring plasmids in clinical Providencia rettgeri isolates from Argentina

Author

De Belder, Denise, primary, Martino, Florencia, additional, Tijet, Nathalie, additional, Melano, Roberto G., additional, Faccone, Diego, additional, De Mendieta, Juan Manuel, additional, Rapoport, Melina, additional, Albornoz, Ezequiel, additional, Petroni, Alejandro, additional, Tuduri, Ezequiel, additional, Derdoy, Laura, additional, Cogut, Sandra, additional, Errecalde, Laura, additional, Pasteran, Fernando, additional, Corso, Alejandra, additional, and Gomez, Sonia A., additional

Published
2023
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7. Dissemination of Verona Integron-encoded Metallo-β-lactamase among clinical and environmental Enterobacteriaceae isolates in Ontario, Canada

Author

Kohler, Philipp, Tijet, Nathalie, Kim, Hyunjin C., Johnstone, Jennie, Edge, Tom, Patel, Samir N., Seah, Christine, Willey, Barbara, Coleman, Brenda, Green, Karen, Armstrong, Irene, Katz, Kevin, Muller, Matthew P., Powis, Jeff, Poutanen, Susan M., Richardson, David, Sarabia, Alicia, Simor, Andrew, McGeer, Allison, and Melano, Roberto G.

Published
2020
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9. Emergence of Carbapenemase-Producing Enterobacteriaceae, South-Central Ontario, Canada

Author

Kohler, Philipp P., Melano, Roberto G., Patel, Samir N., Shafinaz, Shumona, Faheem, Amna, Coleman, Brenda L., Green, Karen, Armstrong, Irene, Almohri, Huda, Borgia, Sergio, Borgundvaag, Emily, Johnstone, Jennie, Katz, Kevin, Lam, Freda, Muller, Matthew P., Powis, Jeff, Poutanen, Susan M., Richardson, David, Rebbapragada, Anu, Sarabia, Alicia, Simor, Andrew, and McGeer, Allison

Subjects
Hospitals -- Ontario -- Canada -- Spain -- India -- Analysis -- Health aspects, Bacterial infections -- Analysis -- Health aspects, Travel -- Ontario -- Canada -- Spain -- India -- Analysis -- Health aspects, Hospital patients -- Analysis -- Health aspects, Medical records -- Analysis -- Health aspects, Travelers -- Analysis -- Health aspects, Beta lactamases -- Analysis -- Health aspects, Pneumonia -- Analysis -- Health aspects, Health
Abstract

The global emergence of carbapenemase-producing Enterobacteriaceae (CPE) poses a threat to the achievements of modern medicine. The Centers for Disease Control and Prevention and the World Health Organization have recently [...]

Published
2018
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11. Emergence of KPC-31, a KPC-3 Variant Associated with Ceftazidime-Avibactam Resistance, in an Extensively Drug-Resistant ST235 Pseudomonas aeruginosa Clinical Isolate

Author

Faccone, Diego, primary, de Mendieta, Juan M., additional, Albornoz, Ezequiel, additional, Chavez, Magali, additional, Genero, Fabiana, additional, Echegorry, Mariano, additional, Ceriana, Paola, additional, Mora, Andrea, additional, Seah, Christine, additional, Corso, Alejandra, additional, Melano, Roberto G., additional, and Pasteran, Fernando, additional

Published
2022
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13. Performance Characteristics of Next-Generation Sequencing for the Detection of Antimicrobial Resistance Determinants in Escherichia coli Genomes and Metagenomes

Author

Rooney, Ashley M., primary, Raphenya, Amogelang R., additional, Melano, Roberto G., additional, Seah, Christine, additional, Yee, Noelle R., additional, MacFadden, Derek R., additional, McArthur, Andrew G., additional, Schneeberger, Pierre H. H., additional, and Coburn, Bryan, additional

Published
2022
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15. Real-Time RT-PCR Allelic Discrimination Assay for Detection of N501Y Mutation in the Spike Protein of SARS-CoV-2 Associated with B.1.1.7 Variant of Concern

Author

Abdulnoor, Mariana, primary, Eshaghi, AliReza, additional, Perusini, Stephen J., additional, Broukhanski, George, additional, Corbeil, Antoine, additional, Cronin, Kirby, additional, Fittipaldi, Nahuel, additional, Forbes, Jessica D., additional, Guthrie, Jennifer L., additional, Kus, Julianne V., additional, Li, Ye, additional, Majury, Anna, additional, Mallo, Gustavo V., additional, Mazzulli, Tony, additional, Melano, Roberto G., additional, Olsha, Romy, additional, Sullivan, Ashleigh, additional, Tran, Vanessa, additional, Patel, Samir N., additional, Allen, Vanessa G., additional, and Gubbay, Jonathan B., additional

Published
2022
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18. Impact of coronavirus disease 2019 (COVID-19) pre-test probability on positive predictive value of high cycle threshold severe acute respiratory coronavirus virus 2 (SARS-CoV-2) real-time reverse transcription polymerase chain reaction (RT-PCR) test results

Author

Gubbay, Jonathan B., primary, Rilkoff, Heather, additional, Kristjanson, Heather L., additional, Forbes, Jessica D., additional, Murti, Michelle, additional, Eshaghi, AliReza, additional, Broukhanski, George, additional, Corbeil, Antoine, additional, Fittipaldi, Nahuel, additional, Hopkins, Jessica P., additional, Kristjanson, Erik, additional, Kus, Julianne V., additional, Macdonald, Liane, additional, Majury, Anna, additional, Mallo, Gustavo V, additional, Mazzulli, Tony, additional, Melano, Roberto G., additional, Olsha, Romy, additional, Perusini, Stephen J., additional, Tran, Vanessa, additional, Allen, Vanessa G., additional, and Patel, Samir N., additional

Published
2021
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19. Escherichia coli O104:H4 infections and international travel

Author

Alexander, David C., Hao, Weilong, Gilmour, Matthew W., Zittermann, Sandra, Sarabia, Alicia, Melano, Roberto G., Peralta, Analyn, Lombos, Marina, Warren, Keisha, Amatnieks, Yuri, Virey, Evangeline, Ma, Jennifer H., Jamieson, Frances B., Low, Donald E., and Allen, Vanessa G.

Subjects
Travelers -- Health aspects, Escherichia coli -- Health aspects, Health
Abstract

In May 2011, officials in northern Germany reported a sudden surge in illness due to Shiga-toxigenic Escherichia coli (STEC). Symptoms of infection ranged from self-limiting episodes of diarrhea to life-threatening [...]

Published
2012
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21. Genomic Epidemiology of Carbapenemase-Producing Enterobacterales at a Hospital System in Toronto, Ontario, Canada, 2007 to 2018

Author

Jamal, Alainna J., primary, Mataseje, Laura F., additional, Williams, Victoria, additional, Leis, Jerome A., additional, Tijet, Nathalie, additional, Zittermann, Sandra, additional, Melano, Roberto G., additional, Mulvey, Michael R., additional, Katz, Kevin, additional, Allen, Vanessa G., additional, and McGeer, Allison J., additional

Published
2021
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22. Real-time RT-PCR Allelic Discrimination Assay for Detection of N501Y Mutation in the Spike Protein of SARS-CoV-2 Associated with Variants of Concern

Author

Abdulnoor, Mariana, primary, Eshaghi, AliReza, additional, Perusini, Stephen J., additional, Corbeil, Antoine, additional, Cronin, Kirby, additional, Fittipaldi, Nahuel, additional, Forbes, Jessica D., additional, Guthrie, Jennifer L., additional, Kus, Julianne V., additional, Majury, Anna, additional, Mazzulli, Tony, additional, Melano, Roberto G., additional, Olsha, Romy, additional, Sullivan, Ashleigh, additional, Tran, Vanessa, additional, Patel, Samir N., additional, Allen, Vanessa G., additional, and Gubbay, Jonathan B., additional

Published
2021
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23. Emergence of Morganellaceae Harboring bla IMP-27 Metalloenzyme in Canada

Author

Boyd, David A., primary, Mataseje, Laura F., additional, Dingle, Tanis, additional, Hoang, Linda, additional, Lefebvre, Brigitte, additional, McGeer, Allison, additional, Melano, Roberto G., additional, Stuart, Ian, additional, Walkty, Andrew, additional, Wilmer, Amanda, additional, and Mulvey, Michael R., additional

Published
2021
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26. Prevalence and distribution of ampc beta-lactamase producing escherichia coli and klebsiella pneumoniae isolates obtained from urine samples at a tertiary care hospital in the caribbean.

Author

Rodriguez, Camille-Ann Thoms, Dawson, Felecia, Cameron, Jenene, Seah, Christine, Reid, Marvin, Melano, Roberto G., and Gossell-Williams, Maxine

Subjects
BETA lactamases, ESCHERICHIA coli, KLEBSIELLA pneumoniae, GRAM-negative bacteria, TERTIARY care, WHOLE genome sequencing
Abstract

Introduction: The aim of this study was to investigate the prevalence and distribution of AmpC beta-lactamases (BLs) in uropathogens (E. coli and K. pneumoniae) at the University Hospital of the West Indies Jamaica (UHWI).Method: De-duplicated consecutive urine samples, collected from January to March 2020 at the UHWI, were analyzed. Screening and phenotypic confirmatory tests were conducted using resistance to cefoxitin and the Disc Approximation Test (DAT) respectively, for isolates of interest. Multiplex PCR was performed on cefoxitin resistant (CR) isolates for the detection of blaCIT, blaMOX, blaFOX, blaACC, and blaDHA genes. Whole genome sequencing (WGS) was used to further detect AmpC BL genes in PCR negative isolates with indeterminate phenotypic results.Results: Sixty-four Gram negative isolates were obtained from 61 patients (55% female), aged 18 months to 88 years old. At least 35% (26) had complicated urinary tract infections. Only 7 out of 64 isolates were E. coli or K. pneumoniae, had antibiograms suggestive of possible AmpC BL production and were CR. DATs confirmed AmpC BL in two of these (1 K. pneumoniae; 1 E. coli), one tested negative (E. coli) and four had inconclusive results (K. pneumoniae). PCR detected blaDHA and blaCIT in two CR isolates. WGS further detected blaCMY-42 in one isolate. The prevalence of screened CR isolates with AmpC BL is 57.14% (4 of 7), representing 6.25% of the sample. AmpC BL producers tested had 100% susceptibility to meropenem and nitrofurantoin.Conclusion: AmpC BL prevalence among E. coli and K. pneumoniae, common urinary pathogens, in the studied isolates is low. Although cefoxitin screening is helpful, phenotypic screening using the DAT can yield indeterminate results best clarified by molecular testing. [ABSTRACT FROM AUTHOR]

Published
2022
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27. Antimicrobial Susceptibility of Neisseria gonorrhoeae Isolates From Peru, 2018 and 2019.

Author

Jorge-Berrocal, Ana, Vargas-Herrera, Natalia, Benites, Carlos, Salazar-Quispe, Fabiola, Mayta-Barrios, Maritza, Barrios-Cárdenas, Yuli J., Melano, Roberto G., Yagui, Martin, Eulogio Castro, M., Munive Guerrero, M.S., Tarazona Reyes, I., Dongo Rojas, E., Cucho Espinoza, C., Ticona Huaroto, C., Palomino Balbín, E., Chumbe Huauya, H., Gutierrez Rojas, M., Peralta Siesquén, C., Gónzales Bustamante, M. K., and Cayuri Cabrera, M.

Published
2022
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29. Impact of COVID-19 pre-test probability on positive predictive value of high cycle threshold SARS-CoV-2 real-time reverse transcription PCR test results

Author

Gubbay, Jonathan B., primary, Rilkoff, Heather, additional, Kristjanson, Heather L., additional, Forbes, Jessica D., additional, Murti, Michelle, additional, Eshaghi, AliReza, additional, Broukhanski, George, additional, Corbeil, Antoine, additional, Fittipaldi, Nahuel, additional, Hopkins, Jessica P., additional, Kristjanson, Erik, additional, Kus, Julianne V., additional, Macdonald, Liane, additional, Majury, Anna, additional, Mallo, Gustavo V, additional, Mazzulli, Tony, additional, Melano, Roberto G., additional, Olsha, Romy, additional, Perusini, Stephen J., additional, Tran, Vanessa, additional, Allen, Vanessa G, additional, and Patel, Samir N, additional

Published
2021
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32. Using Genetic Distance from Archived Samples for the Prediction of Antibiotic Resistance in Escherichia coli

Author

MacFadden, Derek R., primary, Coburn, Bryan, additional, Břinda, Karel, additional, Corbeil, Antoine, additional, Daneman, Nick, additional, Fisman, David, additional, Lee, Robyn S., additional, Lipsitch, Marc, additional, McGeer, Allison, additional, Melano, Roberto G., additional, Mubareka, Samira, additional, and Hanage, William P., additional

Published
2020
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33. Impact of coronavirus disease 2019 (COVID-19) pre-test probability on positive predictive value of high cycle threshold severe acute respiratory coronavirus virus 2 (SARS-CoV-2) real-time reverse transcription polymerase chain reaction (RT-PCR) test results

Author

Gubbay, Jonathan B., Rilkoff, Heather, Kristjanson, Heather L., Forbes, Jessica D., Murti, Michelle, Eshaghi, AliReza, Broukhanski, George, Corbeil, Antoine, Fittipaldi, Nahuel, Hopkins, Jessica P., Kristjanson, Erik, Kus, Julianne V., Macdonald, Liane, Majury, Anna, Mallo, Gustavo V, Mazzulli, Tony, Melano, Roberto G., Olsha, Romy, Perusini, Stephen J., Tran, Vanessa, Allen, Vanessa G., and Patel, Samir N.

Abstract

AbstractObjectives:Performance characteristics of SARS-CoV-2 nucleic acid detection assays are understudied within contexts of low pre-test probability, including screening asymptomatic persons without epidemiological links to confirmed cases, or asymptomatic surveillance testing. SARS-CoV-2 detection without symptoms may represent presymptomatic or asymptomatic infection, resolved infection with persistent RNA shedding, or a false-positive test. This study assessed the positive predictive value of SARS-CoV-2 real-time reverse transcription polymerase chain reaction (rRT-PCR) assays by retesting positive specimens from 5 pre-test probability groups ranging from high to low with an alternate assay.Methods:In total, 122 rRT-PCR positive specimens collected from unique patients between March and July 2020 were retested using a laboratory-developed nested RT-PCR assay targeting the RNA-dependent RNA polymerase (RdRp) gene followed by Sanger sequencing.Results:Significantly fewer (15.6%) positive results in the lowest pre-test probability group (facilities with institution-wide screening having ≤3 positive asymptomatic cases) were reproduced with the nested RdRp gene RT-PCR assay than in each of the 4 groups with higher pre-test probability (individual group range, 50.0%–85.0%).Conclusions:Large-scale SARS-CoV-2 screening testing initiatives among low pre-test probability populations should be evaluated thoroughly prior to implementation given the risk of false-positive results and consequent potential for harm at the individual and population level.

Published
2022
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35. Verona integron-encoded metallo-[beta]-lactamase 1 in enterobacteria, Ontario, Canada

Author

Tijet, Nathalie, Macmullin, Gregory, Lastovetska, Olga, Vermeiren, Christie, Wenzel, Patricia, Stacey-Works, Tina, Low, Donald E., Patel, Samir N., and Melano, Roberto G.

Subjects
Enterobacteriaceae -- Research -- Demographic aspects -- Drug therapy -- Genetic aspects, Beta lactamases -- Research -- Physiological aspects, Enterobacter -- Research -- Demographic aspects -- Drug therapy -- Genetic aspects, Epidemiology -- Research, Cloning -- Research, Health
Abstract

To the Editor: Among Enterobacteriaceae, Verona integron-encoded metallo-[beta]-lactamase 1 (VIM-1) has been found only in Klebsiella pneumoniae in North America (1). We report 4 VIM-1-producing Enterobacteriaceae isolated from 4 patients [...]

Published
2013

40. Genome-based epidemiology and antimicrobial resistance determinants of Neisseria gonorrhoeae isolates with decreased susceptibility and resistance to extended-spectrum cephalosporins in Argentina in 2011-16

Author

Gianecini, Ricardo A., Golparian, Daniel, Zittermann, Sandra, Litvik, Ana, Gonzalez, Silvia, Oviedo, Claudia, Melano, Roberto G., Unemo, Magnus, Galarza, Patricia, Gianecini, Ricardo A., Golparian, Daniel, Zittermann, Sandra, Litvik, Ana, Gonzalez, Silvia, Oviedo, Claudia, Melano, Roberto G., Unemo, Magnus, and Galarza, Patricia

Abstract

OBJECTIVES: Our aim was to describe the molecular epidemiology and antimicrobial resistance determinants of isolates of Neisseria gonorrhoeae with decreased susceptibility and resistance to extended-spectrum cephalosporins (ESCs) in Argentina in 2011-16. METHODS: Gonococcal isolates (n = 158) with decreased susceptibility and resistance to ESCs collected in 2011-16 across Argentina were subjected to WGS and antimicrobial susceptibility testing for six antimicrobials. RESULTS: In total, 50% of the isolates were resistant to cefixime, 1.9% were resistant to ceftriaxone, 37.3% were resistant to azithromycin and 63.9% of the isolates showed an MDR phenotype. Resistance and decreased susceptibility to ESCs was mainly associated with isolates possessing the mosaic penA-34.001, in combination with an mtrR promoter A deletion, and PorB1b amino acid substitutions G120K/A121N. Phylogenetic analysis revealed two main clades of circulating strains, which were associated with the N. gonorrhoeae multiantigen sequence typing (NG-MAST) ST1407 and closely related STs, and characterized by a high prevalence rate, wide geographical distribution and temporal persistence. CONCLUSIONS: N. gonorrhoeae isolates with decreased susceptibility and resistance to ESCs in Argentina have emerged and rapidly spread mainly due to two clonal expansions after importation of one or two strains, which are associated with the international MDR NG-MAST ST1407 clone. The identification of the geographical dissemination and characteristics of these predominant clones may help to focus action plans and public health policies to control the spread of ESC resistance in Argentina. Dual antimicrobial therapy (ceftriaxone plus azithromycin) for gonorrhoea needs to be considered in Argentina., Funding Agencies:Programa de Becas de Formacion en el Exterior en Ciencia y Tecnologia (Grant Bec.Ar - CIT 2017), Argentina Örebro County Council Research Committee Foundation for Medical Research at Örebro University Hospital, Örebro, Sweden

Published
2019
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42. Interspecies DNA acquisition by a naturally competentAcinetobacter baumanniistrain

Author

Traglia, German M., primary, Place, Kori, additional, Dotto, Cristian, additional, Fernandez, Jennifer S., additional, Bahiense, Camila dos Santos, additional, Soler-Bistue, Alfonso, additional, Iriarte, Andres, additional, Tolmasky, Marcelo E., additional, Bonomo, Robert A, additional, Melano, Roberto G., additional, and Ramírez, María Soledad, additional

Published
2018
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44. Molecular characteristics of mcr-1-carrying plasmids and new mcr-1 variant recovered from polyclonal clinical Escherichia coli from Argentina and Canada

Author

Tijet, Nathalie, primary, Faccone, Diego, additional, Rapoport, Melina, additional, Seah, Christine, additional, Pasterán, Fernando, additional, Ceriana, Paola, additional, Albornoz, Ezequiel, additional, Corso, Alejandra, additional, Petroni, Alejandro, additional, and Melano, Roberto G., additional

Published
2017
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46. Genomic analysis of two Acinetobacter baumanniistrains belonging to two different sequence types (ST172 and ST25)

Author

Montaña, Sabrina, Vilacoba, Elisabet, Fernandez, Jennifer S., Traglia, German M., Sucari, Adriana, Pennini, Magdalena, Iriarte, Andres, Centron, Daniela, Melano, Roberto G., and Ramírez, María Soledad

Abstract

•WGS analysis and comparison of two A. baumanniistrains belonging to emergent ST25 and sporadic ST172.•Molecular characterisation revealed differences in the content of antibiotic resistance genes and mobile genetic elements.•Differences at the genomic level can in part explain the success of ST25 in comparison with ST172.•Characterisation of a previously uncharacterised ST (ST172) and further characterisation of the widely studied ST25.

Published
2020
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47. Genome-based epidemiology and antimicrobial resistance determinants of Neisseria gonorrhoeae isolates with decreased susceptibility and resistance to extended-spectrum cephalosporins in Argentina in 2011-16.

Author

Gianecini, Ricardo A, Golparian, Daniel, Zittermann, Sandra, Litvik, Ana, Gonzalez, Silvia, Oviedo, Claudia, Melano, Roberto G, Unemo, Magnus, Galarza, Patricia, Group, Gonococcal Antimicrobial Susceptibility Surveillance Programme-Argentina (GASSP-AR) Working, and Gonococcal Antimicrobial Susceptibility Surveillance Programme-Argentina (GASSP-AR) Working Group

Subjects
MOLECULAR epidemiology, ANTI-infective agents, NEISSERIA gonorrhoeae, CEPHALOSPORINS, AMINO acids, DRUG resistance, DISEASE susceptibility
Abstract

Objectives: Our aim was to describe the molecular epidemiology and antimicrobial resistance determinants of isolates of Neisseria gonorrhoeae with decreased susceptibility and resistance to extended-spectrum cephalosporins (ESCs) in Argentina in 2011-16.Methods: Gonococcal isolates (n=158) with decreased susceptibility and resistance to ESCs collected in 2011-16 across Argentina were subjected to WGS and antimicrobial susceptibility testing for six antimicrobials.Results: In total, 50% of the isolates were resistant to cefixime, 1.9% were resistant to ceftriaxone, 37.3% were resistant to azithromycin and 63.9% of the isolates showed an MDR phenotype. Resistance and decreased susceptibility to ESCs was mainly associated with isolates possessing the mosaic penA-34.001, in combination with an mtrR promoter A deletion, and PorB1b amino acid substitutions G120K/A121N. Phylogenetic analysis revealed two main clades of circulating strains, which were associated with the N. gonorrhoeae multiantigen sequence typing (NG-MAST) ST1407 and closely related STs, and characterized by a high prevalence rate, wide geographical distribution and temporal persistence.Conclusions: N. gonorrhoeae isolates with decreased susceptibility and resistance to ESCs in Argentina have emerged and rapidly spread mainly due to two clonal expansions after importation of one or two strains, which are associated with the international MDR NG-MAST ST1407 clone. The identification of the geographical dissemination and characteristics of these predominant clones may help to focus action plans and public health policies to control the spread of ESC resistance in Argentina. Dual antimicrobial therapy (ceftriaxone plus azithromycin) for gonorrhoea needs to be considered in Argentina. [ABSTRACT FROM AUTHOR]

Published
2019
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50. Dissemination of the mcr-1 colistin resistance gene

Author

Mulvey, Michael R, primary, Mataseje, Laura F, additional, Robertson, James, additional, Nash, John H E, additional, Boerlin, Patrick, additional, Toye, Baldwin, additional, Irwin, Rebecca, additional, and Melano, Roberto G, additional

Published
2016
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