Conjugative plasmidic AmpC detected in Escherichia coli, Proteus mirabilis and Klebsiella pneumoniae human clinical isolates from Portugal

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Santiago, GS (Author) Other; Goncalves, D (Author) Other; Coelho, ID (Author) Other; Coelho, SDD (Author) Other; Helena Sousa (Author) FFUP

Journal

Title: Brazilian Journal of Microbiology

Vol. 51

Pages: 1807-1812

ISSN: 1517-8382

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-00S-JCZ

DOI: 10.1007/s42770-020-00355-5

Abstract (EN): AmpC is a type of beta-lactamase enzyme produced by bacteria; these enzymes are classified in Class C and Group 1, and these confer resistance to cephamycin. Enterobacterales producing AmpC are reported worldwide and have great clinical importance due to therapeutic restriction and epidemiological importance once the easy dissemination by plasmidic genes to other bacteria is a real threat. These genes are naturally found in some enterobacteria asEnterobacter cloacae,Morganella morganii, andCitrobacter freundii, but other species have demonstrated similar resistance phenotype of AmpC production. Genes carried in plasmids have been described in these species conferring resistance to cefoxitin and causing therapeutic failure in some bacterial infections. This work detected and described five clinical strains ofEscherichia coli,Proteus mirabilis, andKlebsiella pneumoniaethat presented plasmid ampC (pAmpC) isolated from the north of Portugal collected in 2009. AmpC production was confirmed by inhibition of the enzyme by cloxacillin and boronic acid in agar diffusion tests. Also, PCR (polymerase chain reaction) was performed for the detection of gene universal to AmpC,bla(ampC), and others to AmpC group:bla(ACC),bla(CIT),bla(CMY),bla(DHA), andbla(EBC). The conjugation in liquid medium for 24 h was realized to determine if gene is localized in chromosome or plasmid. The isolates and their conjugants showed phenotypic characteristics andbla(CMY)andbla(CIT)were detected by PCR corroborating the AmpC characteristics observed in these bacteria. Confirmation of transfer of plasmid containing genes encoding AmpC is of high epidemiological relevance to the hospital studied and demonstrated the importance of AmpC surveillance and studies in hospital and community environments in order to choose the appropriate therapy for bacterial infections.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6