RESUMO
Carbapenem-resistant Klebsiella pneumoniae is a common cause of healthcare-related infections, and it is widespread in hospitals and diverse environments with potentially serious public health implications. Herein, we have reported the isolation and characterization of an environmental Brazilian Klebsiella carbapenemase (BKC-1)-producing K. pneumoniae strain (IEC1205) isolated in 2018 from a river in the Amazon region, Brazil. Antimicrobial susceptibility of this strain was evaluated by broth microdilution and demonstrated resistance to several antibiotics including ß-lactams, aminoglycosides, fluoroquinolones, and polymyxins. It has an extensively drug-resistant phenotype. Genomic analysis revealed that IEC1205 belonged to sequence type 11, clonal complex 258 and the presence of blaBKC-1 and two other ß-lactamase-encoding genes (blaCTX-M-15 and blaSHV-11). The predicted virulence was associated with biofilm formation-related genes, a type VI secretion system, siderophore production, and type I and II fimbriae formation. We have identified an IncQ1 plasmid, named pIEC1205, harboring blaBKC-1 with high similarity to previously described plasmids carrying blaBKC-1 and blaBKC-2 genes. To our knowledge, this is the first report of an environmental BKC-1-producing K. pneumoniae strain.
Assuntos
Infecções por Klebsiella , Sistemas de Secreção Tipo VI , Aminoglicosídeos , Antibacterianos/farmacologia , Proteínas de Bactérias/genética , Brasil , Carbapenêmicos , Células Clonais , Farmacorresistência Bacteriana Múltipla/genética , Fluoroquinolonas , Genômica , Humanos , Klebsiella/genética , Klebsiella pneumoniae/genética , Testes de Sensibilidade Microbiana , Plasmídeos , Polimixinas , Rios , Sideróforos , beta-Lactamases/genética , beta-LactamasRESUMO
Acute gastroenteritis (AG) is responsible for 525,000 deaths worldwide in children under-5-years and is caused by the Human Cosavirus (HCoSV; family Picornaviridae, Genus Cosavirus). Although its health importance, a significant percentage of diarrhea cases (≈ 40 %) still of unknown etiology. In Brazil, few studies have reported HCoSV-A sequences analyzing partial 5' UTR. This study characterized the first near-complete genome of a Cosavirus A (strain AM326) from a child hospitalized with AG in Amazonas state, Northern Brazil. High throughput sequencing (HTS) was performed using the HiSeq™ 2500 platform (Illumina) in one fecal specimen collected from the Surveillance of Rotavirus Network of the Evandro Chagas Institute collected in 2017. Sequence reads were assembled by the De Novo approach using three distinct algorithmic (IDBA-UD, Spades, and MegaHit). The final contig was recovered from the HCoSV-AM326 sample revealing 7,735 nt in length (SRA number SRR12535029; GenBank MT023104) and the genetic characterization, as well as phylogenetic analysis demonstrated a new variant strain from Brazil, highlighting the association of HCoSV-A as a possible causative agent of AG. This finding demonstrates the importance of the metagenomic approach to elucidate cases of diarrhea without a defined etiology, as well as providing a better understanding about the virus genetics, evolution and epidemiology.
Assuntos
Gastroenterite/diagnóstico , Gastroenterite/virologia , Infecções por Picornaviridae/diagnóstico , Infecções por Picornaviridae/virologia , Picornaviridae/classificação , Picornaviridae/genética , Doença Aguda , Brasil , Criança , Genoma Viral , Genômica/métodos , Sequenciamento de Nucleotídeos em Larga Escala , Hospitalização , Humanos , Picornaviridae/isolamento & purificação , RNA ViralRESUMO
The fungus Mucor irregularis is a causative agent of mucormycosis. The transcriptome analysis of the isolated M. irregularis strain C3B revealed the presence of an RNA polymerase domain of a negative-polarity RNA virus. In this work, we describe the gene ontology-based annotation of the Mucor irregularis transcriptome, which includes a putative RNA mycovirus.
RESUMO
BACKGROUND: The multidrug resistance (MDR) phenotype is frequently observed in Acinetobacter baumannii, the most clinically relevant pathogenic species of its genus; recently, other species belonging to the A. calcoaceticus-A. baumannii complex have emerged as important MDR nosocomial pathogens. OBJECTIVES: The present study aimed to verify the occurrence of metallo-ß-lactamase genes among distinct Acinetobacter species in a hospital located in the Brazilian Amazon Region. METHODS: Antimicrobial susceptibility profiles were determined by broth microdilution. The genetic relationships among these isolates were assessed by pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST). Pyrosequencing reads of plasmids carrying the bla NDM-1 gene were generated using the Ion Torrent™ platform sequencing. FINDINGS: A total of six isolates carried bla NDM-1: A. baumannii (n = 2), A. nosocomialis (n = 3), and A. pittii (n = 1); three carried bla IMP-1: A. baumannii, A. nosocomialis, and A. bereziniae. Resistance to colistin was observed for an NDM-1-producing A. nosocomialis isolate. Diverse PFGE patterns and sequence types were found among A. nosocomialis and A. baumannii isolates. The bla NDM-1 sequence was inserted in a Tn125 transposon, while the bla IMP-1 was found as a gene cassette of the class 1 integron In86. MAIN CONCLUSIONS: To the best of our knowledge, this is the first report describing the dissemination of bla NDM-1 among distinct Acinetobacter species recovered from the same hospital in South America.
Assuntos
Acinetobacter/química , Acinetobacter/isolamento & purificação , beta-Lactamases/genética , beta-Lactamases/isolamento & purificação , Acinetobacter/efeitos dos fármacos , Antibacterianos/farmacologia , Brasil , Carbapenêmicos/farmacologia , DNA Bacteriano , Farmacorresistência Bacteriana , Eletroforese em Gel de Campo Pulsado , Sequenciamento de Nucleotídeos em Larga Escala , Humanos , Unidades de Terapia Intensiva , Testes de Sensibilidade Microbiana , Tipagem de Sequências Multilocus , Reação em Cadeia da Polimerase , Análise de Sequência de DNARESUMO
BACKGROUND The multidrug resistance (MDR) phenotype is frequently observed in Acinetobacter baumannii, the most clinically relevant pathogenic species of its genus; recently, other species belonging to the A. calcoaceticus-A. baumannii complex have emerged as important MDR nosocomial pathogens. OBJECTIVES The present study aimed to verify the occurrence of metallo-β-lactamase genes among distinct Acinetobacter species in a hospital located in the Brazilian Amazon Region. METHODS Antimicrobial susceptibility profiles were determined by broth microdilution. The genetic relationships among these isolates were assessed by pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST). Pyrosequencing reads of plasmids carrying the bla NDM-1 gene were generated using the Ion Torrent™ platform sequencing. FINDINGS A total of six isolates carried bla NDM-1: A. baumannii (n = 2), A. nosocomialis (n = 3), and A. pittii (n = 1); three carried bla IMP-1: A. baumannii, A. nosocomialis, and A. bereziniae. Resistance to colistin was observed for an NDM-1-producing A. nosocomialis isolate. Diverse PFGE patterns and sequence types were found among A. nosocomialis and A. baumannii isolates. The bla NDM-1 sequence was inserted in a Tn125 transposon, while the bla IMP-1 was found as a gene cassette of the class 1 integron In86. MAIN CONCLUSIONS To the best of our knowledge, this is the first report describing the dissemination of bla NDM-1 among distinct Acinetobacter species recovered from the same hospital in South America.