Detection and genetic characterization of β-lactamases in Prevotella intermedia and Prevotella nigrescens isolated from oral cavity infections and peritonsillar abscesses

A prospective analysis on β-lactam resistance mechanisms and β-lactamase prevalence was conducted on Prevotella intermedia and Prevotella nigrescens recovered from patients with chronic periodontitis and peritonsillar abscesses. Both phenotypic and genotypic methods were performed to characterize th...

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Detalles Bibliográficos
Autores: Fernández Canigia, Liliana, Cejas, Daniela, Gutkind, Gabriel Osvaldo, Radice, Marcela Alejandra
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/37630
Acceso en línea:http://hdl.handle.net/11336/37630
Access Level:acceso abierto
Palabra clave:Cfxa
Periodontitis
Peritonsillar Abscesses
Prevotella Intermedia
Prevotella Nigrescens
Β-Lactamases
https://purl.org/becyt/ford/3.3
https://purl.org/becyt/ford/3
Descripción
Sumario:A prospective analysis on β-lactam resistance mechanisms and β-lactamase prevalence was conducted on Prevotella intermedia and Prevotella nigrescens recovered from patients with chronic periodontitis and peritonsillar abscesses. Both phenotypic and genotypic methods were performed to characterize the β-lactamases, their coding genes and their genetic contexts. Overall, β-lactamase production was observed in 64% (16/25) P.intermedia and 23.8% (5/21) P.nigrescens (p<0.01). Besides higher β-lactamase production rates were observed in P.intermedia (8/16) than in P.nigrescens (2/16) recovered from chronic periodontitis, almost all isolates from peritonsillar abscesses were producers (8/9 and 3/3, respectively). cfxA, but not cepA and cblA, was detected in those isolates, which were previously categorized as β-lactamase producers. CfxA producing isolates displayed higher β-lactam MICs than non-producers in both species. The most frequent allele was cfxA2, followed by cfxA3 and a new allelic variant named cfxA6. The analysis of the downstream flanking region in the three cfxA variants revealed the association with mobA of Tn. 4555, suggesting their localization in a mobilizable element. β-lactam resistance and cfxA carriage prevalence seems to be not only related to the bacterial species but also to the infection site.