Resistance to antibiotics and heavy metals in <i>escherichia coli</i> from marine fish

Silva, Agostinho Alves de Lima e; Hofer, Ernesto

doi:10.1002/tox.2530080102

Cited by 22 publications

(6 citation statements)

References 19 publications

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“…In the Hg-tolerant strains from the CSS the overall rate of resistance was 33.6%, a value similar to that of Ag-tolerant strains from the hospital sewage. These results are consistent with reports on the frequent association between tolerance to Hg and antimicrobial resistance found in strains isolated from different sources (22,24,26,28,41). Probably this is due to the fact that genes that code for antibiotic resistance and genes that code for mercury resistance are often carried on the same plasmids or other mobile genetic elements (41,42), favouring the occurrence of co-selective processes in the presence of this metal or of antimicrobial drugs.…”

Section: Resultssupporting

confidence: 93%

Heavy metal tolerance (Cr, Ag and Hg) in bacteria isolated from sewage

Silva¹,

Carvalho²,

Souza³

et al. 2012

Braz. J. Microbiol.

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Samples of sewage from a university hospital and a chemistry technical school were analysed for the percentage of bacterial tolerance to chromium (Cr), silver (Ag) and mercury (Hg). Additionally, we investigated the effect of these metals on pigmentation and on some enzymatic activities of the metal tolerant strains isolated, as well as antimicrobial resistance in some metal tolerant Enterobacteriaceae strains. Tolerance to Cr was observed mainly in Gram positive bacteria while in the case of Ag and Hg the tolerant bacteria were predominately Gram negative. Hg was the metal for which the percentage of tolerance was significantly higher, especially in samples from the hospital sewage (4.1%). Mercury also had the most discernible effect on color of the colonies. Considering the effect of metals on the respiratory enzymes, one strain of Ag-tolerant Bacillus sp. and one of Hg-tolerant P. aeruginosa were unable to produce oxidase in the presence of Ag and Hg, respectively, while the expression of gelatinase was largely inhibited in various Gram negative strains (66% by Cr). Drug resistance in Hg-tolerant Enterobacteriaceae strains isolated from the university hospital sewage was greater than 80%, with prevalence of multiple resistance, while the Agtolerant strains from the same source showed about 34% of resistance, with the predominance of monoresistance. Our results showed that, despite the ability of metal tolerant strains to survive and grow in the presence of these elements, the interactions with these metals may result in metabolic or phisiological changes in this group of bacteria.

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Section: Resultssupporting

confidence: 93%

Heavy metal tolerance (Cr, Ag and Hg) in bacteria isolated from sewage

Silva¹,

Carvalho²,

Souza³

et al. 2012

Braz. J. Microbiol.

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“…Earlier investigations reported that approximately 40% of E. coli strains isolated from the intestinal tract of marine fish captured along polluted beaches of Saopaulo were resistant to one or more antibiotics (Alves de Lima and Hofer, 1993). Ogbondeminu and Olayemi (1993) also found 55.9% enteric isolates from fish which were resistant to three to four antibacterial drugs.…”

Section: Resultsmentioning

confidence: 99%

“…However, only few studies have attempted to focus on the resistant bacteria in the wild fishes (Alves de Lima and Hofer, 1993;Miranda and Zemelman, 2001;Matyar et al, 2004). Digha (21 0 37'N, 87 0 33'E) situated in the coastal line of Bay of Bengal is one of the largest fish landing centre of West Bengal, India.…”

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confidence: 99%

Antibiotic resistant bacteria in consumable fishes from Digha coast, West Bengal, India

Ghosh

Mandal

2010

Proc Zool Soc

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Antibiotic resistant bacteria from the commercial marine catch of the pelagic fishes in the Bay of Bengal at Digha coast (21 0 37'N, 87 0 33'E), West Bengal, India were evaluated. Aerobic heterotrophic and gram negative, along with the enteric bacteria were enumerated from gill and intestinal homogenates. Media supplemented with the antibiotics were used to evaluate the antibiotic resistant bacterial load. Viable counts (CFU g -1 ) of heterotrophic and resistant bacteria from gills were higher than those from the intestinal content. Significant variations were also noted among the percentages of bacteria (CFU) resistant to different antibiotics. High incidences of resistance to ampicillin, as well as, most sensitivity to chloramphenicol were noticed for the isolated bacterial strains. Results of the present study suggests that commercial marine fish catch at Digha coast might play a role as carrier / reservoir of antibiotic resistant bacteria creating a health risk for the fish consumers.

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“…In this context, the use of E. coli as a sanitary indicator for fish samples has been first reported in the 1930s [21] and since then widely applied as a microbiological quality parameter, especially on what fecal contamination is concerned [22][23][24][25].…”

Section: Escherichia Coli In Fishmentioning

confidence: 99%