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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2015.tde-26082015-175023
Document
Author
Full name
Tatiane Nascimento
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2015
Supervisor
Committee
Huenuman, Nilton Erbet Lincopan (President)
Maldonado, Gabriel Padilla
Sato, Maria Inês Zanoli
Title in Portuguese
Ocorrência e diversidade de bactérias gram-negativas multirresistentes em ambientes aquáticos públicos no estado de São Paulo.
Keywords in Portuguese
Ambiente aquático
Beta-lactamases
Carbapenêmicos
Cefalosporinas
Fluoroquinolonas
Gram-negativos
PMQR
Resistência aos antibacterianos
Abstract in Portuguese
Atividades antropogênicas relacionadas ao uso massivo de antibacterianos tem favorecido para que ambientes aquáticos sejam importantes locais para seleção e/ou disseminação de bactérias multirresistentes (MR). O objetivo do estudo foi monitorar a ocorrência de bactérias MRs em ambientes aquáticos públicos no estado de SP, caracterizando genótipos de resistência adquirida. Foram analisados 50 isolados de bactérias gram-negativas, recuperadas de amostras de água, sendo que 70% dos isolados apresentaram perfil de MR, identificando-se os genes blaCTX-M-2 (n= 5), blaCTX-M-9 (n= 1), blaCTX-M-15 (n= 2), blaKPC-2 (n= 3), qnrB (n= 1), oqxA (n= 3), oqxB (n= 3) e, aac(6)1b-cr (n= 7). Destaca-se a primeira detecção de A. calcoaceticus produtora de KPC-2. Ambientes aquáticos de acesso público podem ser importantes fontes para a disseminação e/ou transmissão de uma ampla variedade de espécies bacterianas MRs tanto para seres humanos como para ecossistemas associados, sendo que a presença de genótipos endêmicos sugere contaminação por esgoto doméstico e/ou hospitalar.
Title in English
Ocurrence and diversity of multidrug-resistant gram-negative bactéria in public aquatic environments in southeastern Brazil.
Keywords in English
Antibiotic resistance
Aquatic environment
Beta-lactamases
Carbapenems
Cephalosporins
Fluoroquinolones
Gram-negative bacteria
PMQR
Abstract in English
Anthropogenic activities related to the massive use of antibacterial has contributed to the selection and spread of multidrug-resistant (MDR) into the aquatic environment. This study aimed to monitor the occurrence of MDR bacteria in public aquatic environments, in the state of São Paulo, characterizing genotypes of acquired resistance. Of the 50 gram-negative isolates, recovered of water samples, 70% exhibited a MDR profile. Indeed, blaCTX-M-2 (n= 5), blaCTX-M-9 (n= 1), blaCTX-M-15 (n= 2)-, blaKPC-2 (n= 3)-, qnrB (n= 1)-, oqxA (n= 3)-, oqxB (n= 3)- and aac(6)-1b-cr (n = 7) genes were identified. Noteworthy is the first the detection of KPC-2-producing Acinetobacter calcoaceticus. Aquatic environments, with public access, may be important sources for the dissemination and/or transmission of a wide variety of MDR bacterial species to both humans and associated ecosystems. Moreover, the presence of endemic genotypes suggests contamination by domestic and/or hospital sewage.
 
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Publishing Date
2015-08-28
 
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