Open AccessPhenotypic and Genotypic Characteristics of Uropathogenic Escherichia coli Isolates from Kenya
Author(s) -
Catherine Muriuki,
Lilian Ogonda,
Cecilia Kyany’a,
Daniel Matano,
Clement Masakhwe,
Erick Odoyo,
Lillian Musila
Publication year - 2022
Publication title -
microbial drug resistance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 70
eISSN - 1931-8448
pISSN - 1076-6294
DOI - 10.1089/mdr.2020.0432
Subject(s) - biology , cefoxitin , microbiology and biotechnology , genotype , escherichia coli , phylogenetic tree , antibiotics , cephalosporin , sulfamethoxazole , antibiotic resistance , beta lactamase , polymerase chain reaction , gene , bacteria , genetics , staphylococcus aureus
Uropathogenic Escherichia coli (UPECs) are a significant cause of urinary tract infections (UTIs). In Kenya, UTIs are typically treated with β-lactam antibiotics without antibiotic susceptibility testing, which could accelerate antibiotic resistance among UPEC strains. Aim: This study determined the occurrence of UPEC producing extended-spectrum β-lactamases (ESBLs), the genes conferring resistance to β-lactams, and the phylogenetic groups associated with ESBLs in Kenyan UPECs. Methodology: Ninety-five UPEC isolates from six Kenyan hospitals were tested for ESBL and plasmid-mediated AmpC β-lactamase (pAmpC) production by combined disk diffusion and disk approximation tests, respectively. Real-time and conventional polymerase chain reactions (PCRs) were used to detect three ESBL and six pAmpC genes, respectively, and phylogenetic groups were assigned by a quadruplex PCR method. Results: Twenty-four percent UPEC isolates were ESBL producers with bla CTX-M (95.6%), bla TEM (95.6%), and bla SHV (21.7%) genes detected. Sixteen isolates had bla CTX-M/TEM , whereas five had bla TEM/CTX-M/SHV . A total of 5/23 ESBLs were cefoxitin resistant, but no AmpC genes were detected. The UPECs belonged predominantly to phylogenetic groups B2 (31/95; 32.6%) and D (30/95; 31.6%), while groups B2 and A had the most ESBL producers. Conclusions: β-Lactam antibiotics have reduced utility for treating UTIs as a quarter of UPECs were ESBL producing. Single or multiple ESBL genes were present in UPECs, belonging primarily to phylogenetic groups B2 and A.