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>Journals >Revista Biomédica >Year 2004, Issue 3


Tzoc E, Arias ML, Valiente C
Effects of hospitalary waste water residues on the antibiotic resistance patterns of Escherichia coli and Aeromonas sp.
Rev Biomed 2004; 15 (3)

Language: Español
References: 32
Page: 165-172
PDF: 39.59 Kb.


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ABSTRACT

Introduction. Health attention centers, especially hospitals, represent important sources of antibiotic discharges into the environment, producing a big effect on the physical, chemical, and biological composition of receptor bodies.
Material and methods. In order to assess the impact of a hospital effluent on the antibiotic resistance of freshwater bacterial populations, water samples were collected, upstream and downstream, from a creek bordering a Class A hospital, in San José, Costa Rica. 120 samples of Escherichia coli and 75 Aeromonas sp strains were evaluated and tested for antibiotic susceptibility by the Kirby-Bauer methodology.
Results. Most E. coli strains were resistant to ampicillin and amoxicillin, with a 57 and 45% resistance, respectively, they also showed significant resistance to tetracycline.
In the Aeromonas sp isolates, the greatest resistance rates were for the same antibiotics as E. coli, probably due to the intrinsic resistance of these bacteria to ß lactamics.
Discussion. The hospital effluent shows an important effect on the occurrence of resistant strains, although it is not the only source, since the resistance patterns of the bacteria isolated from the creek before receiving the hospitalary effluent already showed high levels.


Key words: Antibiotics, antimicrobial resistance, Escherichia coli, Aeromonas sp., waste water.


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