Article (Scientific journals)
Identification of b-Lactamase-Encoding (bla) Genes in Phenotypically b-Lactam-Resistant Escherichia coli Isolated from Young Calves in Belgium
Guérin, Virginie; Thiry, Damien; Lucas, Perrick et al.
2021In Microbial Drug Resistance: Mechanism, Epidemiology, and Disease
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Keywords :
Escherichia coli; calves; b-lactams resistance; microarray; whole genome sequencing; bla genes
Abstract :
[en] The bla genes identification present in 94 phenotypically resistant Escherichia coli isolated from feces or intestinal contents of young calves with diarrhea or enteritis in Belgium was performed by microarrays (MA) and whole genome sequencing (WGS). According to their resistance phenotypes to 8 b-lactams at the disk diffusion assay these 94 E. coli produced a narrow-spectrum-b-lactamase (NSBL), an extended-spectrum-b-lactamase (ESBL) or a cephalosporinase (AmpC). All ESBL-encoding genes identified by MA and WGS belonged to the blaCTX-M family, with a majority to the blaCTX-M-1 subfamily. Two different genes encoding an AmpC, blaCMY-2, and blaDHA-1 were detected in isolates with an AmpC phenotype. The blaTEM-1 and the blaOXA-1 were detected alone in isolates with a NSBL phenotype or in combination with ESBL-/AmpC-encoding bla genes. Furthermore, the WGS identified mutations in the ampC gene promoter at nucleotides -42 (C>T) and/or -18 (G>A) that could not be identified by MA, in several isolates with an AmpC-like resistance phenotype. No carbapenemaseencoding gene was detected. To our knowledge this is the first survey on the identification of bla genes in E. coli isolated from young diarrheic or septicemic calves in Belgium.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Guérin, Virginie ;  Université de Liège - ULiège > FARAH
Thiry, Damien ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires (DMI) > Bactériologie et pathologie des maladies bactériennes
Lucas, Perrick
Blanchard, Yannick
Cawez, Frédéric ;  Université de Liège - ULiège > Département des sciences de la vie > Macromolécules biologiques
Mercuri, Paola ;  Université de Liège - ULiège > Département des sciences de la vie > Macromolécules biologiques
Galleni, Moreno 
Saulmont, Marc
Mainil, Jacques ;  Université de Liège - ULiège > Département des maladies infectieuses et parasitaires (DMI) > Bactériologie et pathologie des maladies bactériennes
Language :
English
Title :
Identification of b-Lactamase-Encoding (bla) Genes in Phenotypically b-Lactam-Resistant Escherichia coli Isolated from Young Calves in Belgium
Publication date :
2021
Journal title :
Microbial Drug Resistance: Mechanism, Epidemiology, and Disease
ISSN :
1076-6294
eISSN :
1931-8448
Publisher :
Mary Ann Liebert, Larchmont, United States - New York
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 April 2021

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