Pandemic extra-intestinal pathogenic Escherichia coli (ExPEC) clonal group O6-B2-ST73 as a cause of avian colibacillosis in Brazil

Autor(es)

Vieira Cunha, Marcos Paulo ; Saidenberg, Andre Becker ; Moreno, Andrea Micke ; Piantino Ferreira, Antonio Jose ; Midolli Vieira, Monica Aparecida ; Tardelli Gomes, Tania Aparecida ; Knobl, Terezinha

• Tipo de documento: Artigo Científico
• Fonte: PLoS One; v. 12, n. 6 JUN 8 2017.
• Citações Web of Science: 7

Resumo

Extra-intestinal pathogenic Escherichia coli (ExPEC) represent an emerging pathogen, with pandemic strains increasingly involved in cases of urinary tract infections (UTIs), bacteremia, and meningitis. In addition to affecting humans, the avian pathotype of ExPEC, avian pathogenic E. coli (APEC), causes severe economic losses to the poultry industry. Several studies have revealed overlapping characteristics between APEC and human ExPEC, leading to the hypothesis of a zoonotic potential of poultry strains. However, the description of certain important pandemic clones, such as Sequence Type 73 (ST73), has not been reported in food sources. We characterized 27 temporally matched APEC strains from diverse poultry farms in Brazil belonging to the O6 serogroup because this serogroup is frequently described as a causal factor in UTI and septicemia in humans in Brazil and worldwide. The isolates were genotypically characterized by identifying ExPEC virulence factors, phylogenetically tested by phylogrouping and multilocus sequence type (MLST) analysis, and compared to determine their similarity employing the pulsed field gel electrophoresis (PFGE) technique. The strains harbored a large number of virulence determinants that are commonly described in uropathogenic E. coli (UPEC) and sepsis associated E. coli (SEPEC) strains and, to a lesser extent in neonatal meningitis associated E. coli (NMEC), such as pap (85%), sfa (100%), usp (100%), cnf1 (22%), kpsMTII (66%), hlyA (52%), and ibeA (4%). These isolates also yielded a low prevalence of some genes that are frequently described in APEC, such as iss (37%), tsh, ompT, and hlyF (8% each), and cvi/cva (0%). All strains were classified as part of the B2 phylogroup and sequence type 73 (ST73), with a cluster of 25 strains showing a clonal profile by PFGE. These results further suggest the zoonotic potential of some APEC clonal lineages and their possible role in the epidemiology of human ExPEC, in addition to providing the first description of the O6-B2-ST73 clonal group in poultry. (AU)

• Processo FAPESP: 05/57500-9 - Avaliação do potencial zoonótico de Escherichia coli sfa+, sorogrupo o6, isoladas de aves com colibacilose: caracterização genotípica e fenotípica
• Beneficiário: Terezinha Knöbl
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 14/11523-7 - Pesquisa e caracterização de genes plasmidiais de resistência às quinolonas em escherichia coli isoladas da cadeia de produção de aves e suínos
• Beneficiário: Marcos Paulo Vieira Cunha
• Modalidade de apoio: Bolsas no Brasil - Doutorado