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2011, Número 3

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Vet Mex 2011; 42 (3)


Resistencia a penicilina G y oxacilina, de cepas de Staphylococcus aureus aisladas de mastitis bovina subclínica

Zschöck M, El-Sayed A, Eissa N, Lämmler C, Castañeda-Vazquez H

Idioma: Español/Inglés
Referencias bibliográficas: 46
Paginas: 207-217
Archivo PDF: 267.66 Kb.


RESUMEN

De 530 diferentes cepas de S. aureus aisladas de casos de mastitis subclínica bovina, se seleccionaron 68 cepas de S. aureus procedentes de Alemania (n = 26), Indonesia (n = 16), México (n = 16) y Brasil (n = 10), para estudiarlas en la presente investigación. Las cepas fueron analizadas fenotípica y genotípicamente para observar su resistencia a penicilina G y oxacilina. Para una identificación inicial se utilizó el sistema Api 32 Staph y la prueba de coagulasa. El resultado se confirmó por la detección molecular de los genes específicos de S. aureus 23S rRNA, nucleasa termoestable (nuc), factor aglutinante (clfA), coagulasa (coa) y la proteína A (spa) región Xr. La selección primaria de las cepas sospechosas se hizo al azar, seleccionando una cepa por hato; además sólo se incluyeron en el estudio cepas con diferentes perfiles de macrorrestricción. La resistencia genotípica a meticilina y penicilina se estudió mediante la identificación de los genes mecA y blaZ, respectivamente. El gen mecA fue detectado sólo en un aislamiento de S. aureus de Brasil y no fue resistente fenotípicamente a la meticilina, lo cual se demostró mediante los métodos de difusión estándar en discos, el uso del Chromoagar-BBL y la determinación de la concentración mínima inhibitoria (MIC, por sus siglas en inglés) por Vitek II. La detección genotípica de la resistencia de las cepas a la penicilina se basó en la detección del gen blaZ; y se observó en 50 cepas investigadas (73.5%). Sin embargo, sólo 40 cepas (58.8%) fueron fenotípicamente resistentes a la penicilina. Los resultados obtenidos muestran que la resistencia de las cepas aisladas de campo S. aureus a las penicilinas semisintéticas, actualmente no es un problema importante en las vacas lecheras, a pesar del uso extensivo de esas sustancias antibióticas en el campo en los países investigados.


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