LAURO VIEIRA PERDIGAO NETO

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LIM/49 - Laboratório de Protozoologia, Hospital das Clínicas, Faculdade de Medicina

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  • article 21 Citação(ões) na Scopus
    Multidrug-resistant Stenotrophomonas maltophilia: Description of new MLST profiles and resistance and virulence genes using whole-genome sequencing
    (2018) RIZEK, Camila Fonseca; JONAS, Daniel; PAEZ, Jorge Isaac Garcia; ROSA, Juliana Ferraz; PERDIGAO NETO, Lauro Vieira; MARTINS, Roberta Ruedas; MORENO, Luisa Z.; ROSSI JUNIOR, Alfio; LEVIN, Anna S.; COSTA, Silvia Figueiredo
    Objectives: Stenotrophomonas maltophilia is an opportunistic pathogen that has high intrinsic and acquired antimicrobial resistance, with great genetic diversity. The aim of this study was to characterise four S. maltophilia clinical isolates displaying different susceptibility profiles using whole-genome sequencing. Methods: The whole genomes of four clinical isolates of S. maltophilia from three patients were sequenced using Ion Torrent (TM) PGM technology. The isolates presented different susceptibilities to trimethoprim/sulfamethoxazole (SXT) and levofloxacin. Results: Three new multilocus sequence typing (MLST) profiles were identified (ST144, ST172 and ST173), differing in virulence and resistance genes. The ST172 isolate had more genes related to toxins than related to motility or adhesion and had different types of efflux pumps than the other isolates. The SXT-resistant strains belonged to ST172 or ST144 and did not harbour the sul1, sul2 or dfrA resistance genes. Strains I and II, from the same patient and belonging to the same ST but differing in resistance to SXT, had all of the resistance genes searched for in common, except for the SmeABC efflux pump complex genes that were only found in the SXT-resistant strain. All strains, including the strain susceptible to levofloxacin, harboured the qnrB gene, which may question the importance of this gene in determining levofloxacin resistance in S. maltophilia. Conclusion: Here we describe three new MLST profiles. Resistance to SXT in these strains appears to be associated with efflux pumps.
  • article 4 Citação(ões) na Scopus
    Polymyxin-resistant Pseudomonas aeruginosa assigned as ST245: First report in an intensive care unit in Sao Paulo, Brazil
    (2019) ORSI, Tatiana D'Annibale; PERDIGAO NETO, Lauro Vieira; MARTINS, Roberta Cristina Ruedas; LEVIN, Anna S.; COSTA, Silvia Figueiredo
    Objectives: Pseudomonas aeruginosa is a Gram-negative bacterium that causes severe infections, especially in hospitalised and immunocompromised patients. Polymyxins are the last therapeutic option to treat infections caused by this micro-organism. Here we describe a polymyxin-resistant P. aeruginosa assigned as sequence type (ST) 245 for the first time in Brazil. Methods: Antimicrobial susceptibility testing of the isolate was performed. In addition, whole-genome sequencing was performed and its virulence and resistance genes were analysed. Results: The P. aeruginosa ST245 isolate was identified for the first time in Brazil in a patient with ventilator-associated pneumonia hospitalised at Hospital das Clinicas, Sao Paulo. Analysis of the genome showed the presence of several resistance and virulence genes. Mutations in beta-lactam resistance genes were found in beta-lactamases, outer membrane proteins, efflux pump and penicillin-binding proteins. Polymorphisms related to pathways leading to polymyxin resistance are also present, such as lipid A or keto-deoxyoctulosonate modification with aminoarabinose as well as activation of lipopolysaccharide (LPS). Conclusion: Such findings may represent an alert for the spread of an unusual profile in the country.