Occurrence, antibiotic-resistance and virulence of E. coli strains isolated from mangrove oysters (Crassostrea gasar) farmed in estuaries of Amazonia.

Abstract:

:Concentration of bacterial species indicative of fecal contamination in the gut of mangrove oysters (Crassostrea gasar) is a major concern for public health and food surveillance. Our work aimed to determine the occurrence, antibiotic-resistance, phylogenetic profile and virulence of Escherichia coli strains isolated from C. gasar farmed in four estuaries of Amazonia. Santo Antônio de Urindeua was the sampling point with the highest number of E. coli cells in oyster samples (104 per 100 g of sample). Twenty-four isolates (52.2%) showed resistance to cephalotin and 18 to amoxicillin (39.1%). Eighteen clonal populations were determined by rep-PCR and were mainly affiliated to the pathogenic and commensal phylo-groups B1 and D. The presence of elt genes suggests that 10 of these clones belong to the Enterotoxigenic Escherichia coli pathotype. Plasmids, mostly of the F incompatibility group, were detected in the majority of the strains. All isolates were susceptible to last-resort antibiotics.

journal_name

Mar Pollut Bull

authors

Oliveira AMS,Baraúna RA,Marcon DJ,Lago LAB,Silva A,Lusio J,Tavares RDS,Tacão M,Henriques I,Schneider MPC

doi

10.1016/j.marpolbul.2020.111302

subject

Has Abstract

pub_date

2020-08-01 00:00:00

pages

111302

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(20)30420-3

journal_volume

157

pub_type

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