PROPAGATION OF ANTIMICROBIAL RESISTANT Salmonella spp. IN BIVALVE MOLLUSKS FROM ESTUARY AREAS OF BAHIA, BRAZIL

Authors

  • Carla Silva da Silveira Center for Agricultural, Environmental and Biological Sciences, Faculty of Fishing Engineering, Universidade Federal do Recôncavo da Bahia, Cruz das Almas, BA.
  • Oscarina Viana de Sousa Sea Science Institute, Universidade Federal do Ceará, Fortaleza, CE.
  • Norma Suely Evangelista-Barreto Center for Agricultural, Environmental and Biological Sciences, Faculty of Fishing Engineering, Universidade Federal do Recôncavo da Bahia, Cruz das Almas, BA.

DOI:

https://doi.org/10.1590/1983-21252016v29n222rc

Keywords:

Antibiotics. Multidrug resistance. Food safety. Betalactamases.

Abstract

In recent years, the emergence of resistant pathogens has complicated the treatment of bacterial infections in livestock production as well as in the medical field, due to the development of resistance mechanisms by microorganisms. The objective of this study was to delineate the antimicrobial resistance profile of Salmonella spp. strains isolated from bivalve mollusks (oysters and mussels) and from estuarine environment water of two regions of Bahia, Brazil. Twenty-seven strains, 12 isolated from bivalve mollusks and 15 from estuarine water, were tested. Eight antimicrobial agents (phenicol, beta-lactams, tetracyclines, quinolones and fluoroquinolones classes) were used for a susceptibility test, Minimum Inhibitory Concentration (MIC) and extended-spectrum beta-lactamases (ESBLs) production. Isolates showed high susceptibility to the classes of antimicrobial agents tested, with resistance only to nalidixic acid (27%), ampicillin (25%) and tetracycline (25%). Bacterial resistance was of chromosomal origin and the multidrug resistance index (MAR) among isolates of shellfish (mussels in natura) was 0.25. The MIC was found to be 100 µg/mL, 500 µg/mL and 350 µg/mL to nalidixic acid, ampicillin and tetracycline, respectively. None of the isolates presented ESBLs production. The presence of multidrug-resistant and high MIC Salmonella spp. is being conveyed in extraction areas of bivalve mollusks in the State of Bahia, Brazil.

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Published

03-05-2016

Issue

Section

Fishery Engineering