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2022, Número 2

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Acta Pediatr Mex 2022; 43 (2)


Tipificación de aislamientos de Ralstonia mannitolilytica en un hospital pediátrico de la Ciudad de México

Aquino-Andrade A, Merida-Vieyra J, Lara-Hernández A, Hernández OH, De Colsa RA

Idioma: Español
Referencias bibliográficas: 29
Paginas: 73-78
Archivo PDF: 298.58 Kb.


RESUMEN

Introducción: Ralstonia mannitolilytica es un agente causal de infecciones asociadas al cuidado de la salud. Las especies del género Ralstonia son difíciles de identificar y diferenciar. Nuestro objetivo fue identificar y tipificar aislamientos de R. mannitolilytica obtenidos de hemocultivos de pacientes pediátricos.
Materiales y Métodos: Colectamos 10 aislamientos de R. mannitolilytica identificados con un sistema automatizado, un sistema de espectrometría de masas con analizador de tiempo de vuelo y desorción mediante láser asistida por matriz (MALDI-TOF-MS, Matrix-assisted laser desorption/ionization time of flight mass spectrometry) y análisis del gen 16S rRNA. Se determinó el perfil de resistencia y se tipificaron las carbapenemasas a través de PCR y secuenciación. Se estableció la relación clonal de los aislamientos mediante electroforesis en gel de campos pulsados (PFGE).
Resultados: El sistema MALDI-TOF-MS y análisis del gen 16S rRNA identificaron a los aislamientos como R. mannitolilytica; todos pertenecieron a la misma clona y fueron resistentes a meropenem, se detectaron a las carbapenemasas OXA-443 y OXA-444 en todos ellos.
Conclusiones: Este es el primer reporte de aislamientos de R. mannitolilytica con origen clonal y que poseen las carbapenemasas OXA-443 y OXA-444 en pacientes pediátricos mexicanos.


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