DOI: https://doi.org/10.21897/rmvz.1124

Resistencia a antimicrobianos en E. coli y Salmonella spp. de terneros del sur de Chile

Antimicrobial resistance in E. coli and Salmonella spp. isolates from calves in southern Chile

Luis Pablo Hervé Claude, Bárbara Valenzuela Held, Manuel Moroni Rodríguez, Enrique Paredes Herbach, María José Navarrete Talloni

Resumen


Objetivo: Describir los hallazgos de resistencia a antimicrobianos en aislados de Salmonella spp. y E. coli obtenidos de terneros de menos de 30 días de edad en el sur de Chile. Materiales y métodos: Se obtuvieron reportes de necropsia y microbiología de 107 terneros en el período comprendido entre 2002 y 2015. Adicionalmente se generó un Score de Resistencia a antimicrobianos para permitir la comparación entre aislados que fueron evaluados contra un set de distintos antimicrobianos. Resultados: No se observa una clara tendencia en la resistencia en el período en estudio, con similares niveles de resistencia observados para E. coli, E. coli β-hemolítica y Salmonella spp. Aproximadamente 50% de los aislados mostraron amplia sensibilidad a antimicrobianos, y entre 19 y 36% de los aislados demostraron potencial de resistencia extendida y pan resistencia respectivamente. Se encontraron múltiples patrones de resistencia, incluyendo 32 para E. coli, 17 para E. coli β-hemolítica y 10 para Salmonella spp. Conclusiones: En general, E. coli se mostró más sensible a ceftriaxona, E. coli β-hemolítica a Florfenicol y Salmonella spp. a gentamicina. En contraste, estos agentes fueron resistentes a amoxicilina, ampicilina y oxitetraciclina respectivamente. Este estudio es único en su aproximación y provee de información útil para médicos veterinarios y productores sobre los patrones de resistencia que amenazan la salud de los terneros. Estos resultados pueden ayudar a médicos veterinarios de campo a enfrentar y controlar efectivamente las diarreas en terneros. 


Palabras clave


Lechería; agente antimicrobiano; tratamiento

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Referencias


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