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Antimicrobial Resistance and Minimum Inhibitory Concentrations of Bacteria Isolated from Bustards in the United Arab Emirates

T. A. Bailey, C. Silvanose, U. Wernery, J. H. Samour and J. Naldo
Avian Diseases
Vol. 42, No. 4 (Oct. - Dec., 1998), pp. 690-697
DOI: 10.2307/1592704
Stable URL: http://www.jstor.org/stable/1592704
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Antimicrobial Resistance and Minimum Inhibitory Concentrations of Bacteria Isolated from Bustards in the United Arab Emirates
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Abstract

The resistance to 11 antimicrobial agents of bacteria isolated from clinical and postmortem cases of five species of bustards maintained in captivity in the United Arab Emirates (UAE) from 1995 to 1997 was determined by disc sensitivity. Of 226 isolates, 169 (74.8%) were gram-negative bacilli, with the majority identified as Escherichia coli (28.8%) and Pseudomonas aeruginosa (19%). The isolates of E. coli showed a high prevalence of resistance to amoxycillin (69%), tetracycline (66.7%), and sulphamethoxazole (43.3%). Moderate resistance to enrofloxacin was observed in E. coli (30%) and P. aeruginosa (19%) isolates. The minimum inhibitory concentrations (MICs) to seven antimicrobial agents were determined for 133 bacterial isolates from bustards during 1996 to 1997. Enrofloxacin (concentration required to inhibit 50% of the isolates $[{\rm MIC}_{50}]<0.5\ \mu {\rm g}/{\rm ml}$) and gentamicin ( MIC50≤ 1.0 μ g/ ml) exhibited good activity against both gram-negative bacilli and staphylococci isolated from bustards. Enrofloxacin ( MIC50≤ 1.5 μ g/ ml), gentamicin ( MIC50≤ 2.0 μ g/ ml), and piperacillin ( MIC50≤ 4.0 μ g/ ml) exhibited good activity against P. aeruginosa isolates. Amoxycillin/clavulanic acid showed good activity (concentration required to inhibit 90% of the isolates [ MIC90]≤ 2.0 μ g/ ml) against gram-positive cocci and moderate activity ( MIC50≤ 3.0 μ g/ ml) against E. coli, Salmonella spp., and Klebsiella spp. Amoxycillin exhibited good activity ( MIC50≤ 0.5 μ g/ ml) against gram-positive organisms and moderate activity ( MIC50≤ 1.0 μ g/ ml) against Salmonella spp. These results provide information on the prevalence of resistant bacterial strains and the MICs of organisms derived from bustards in the UAE. /// Durante el período de 1995 a 1997, por medio de discos de susceptibilidad antimicrobiana, se determinó la resistencia a 11 agentes antimicrobianos para bacterias aisladas de casos clínicos y casos de necropsia de 5 especies de avutardas mantenidas en cautiverio en los Emiratos Arabes Unidos. De 226 aislamientos, 169 (74.8%) fueron bacilos gram-negativos con la mayoría identificada como Escherichia coli (28.8%) y Pseudomona aeruginosa (19%). Los aislamientos de E. coli mostraron una prevalencia alta de resistencia a la amoxicilina (69%), tetraciclina (66.7%) y sulfametoxasol (43.3%). Se observó-resistencia moderada a la enrofloxacina en E. coli (30%) y P. aeruginosa (19%) cepas. La concentración inhibitoria mínima (MIC) a siete agentes antimicrobianos fue determinada para las 133 cepas bacterianas aisladas de avutardas durante 1996 y 1997. La enrofloxacina (concentración requerida para inhibir 50% del crecimiento [ MIC50]≤ 0.5 μ g/ ml) y la gentamicina ( MIC50≤ 1.0 μ g/ ml) exhibieron buena actividad contra los bacilos gram-negativos y contra los Staphylococcus aislados de avutardas. La enrofloxacina ( MIC50≤ 1.5 μ g/ ml), gentamicina ( MIC50≤ 2.0 μ g/ ml) y piperacilina ( MIC50≤ 4.0 μ g/ ml) mostraron buena actividad contra los aislamientos de P. aeruginosa. La amoxicilina/ácido clavulánico mostró una buena actividad (concentración requerida para inhibir 90% de los aislamientos [ MIC90]≤ 2 μ g/ ml) contra cocos grampositivos y moderada actividad ( MIC50≤ 3.0 μ g/ ml) contra E. coli, Salmonella spp. y Klebsiella spp. La amoxicilina exhibió buena actividad ( MIC50≤ 0.5 μ g/ ml) contra organismos gram-positivos y moderada actividad ( MIC50≤ 1.0 μ g/ ml) contra Salmonella spp. Estos resultados suministran información sobre la prevalencia de la resistencia de bacterias y las concentraciones inhibitorias mínimas de organismos derivados de los avutardas en los Emiratos Arabes Unidos.

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