Antifungal susceptibility of Aspergillus genus determined by the Etest® method: eleven years of experience at the Instituto Médico La Floresta. Caracas, Venezuela.

Susceptibilidad a los antifúngicos del género Aspergillus determinada por el método Etest®: once años de experiencia en el Instituto Médico La Floresta. Caracas, Venezuela.

Palabras clave: susceptibilidad, Aspergillus spp, especies crípticas, antifúngicos, método de difusión Etest, concentración mínima inhibitoria

Resumen

El objetivo de esta investigación fue determinar la susceptibilidad de Aspergillus spp., a cuatro antifúngicos mediante el método de Etest®, en aislados clínicos (muestras respiratorias, partes blandas, óticas, y oculares, entre otras) provenientes de un centro de salud privado en Venezuela. Se evaluaron 33 cepas: 11 Aspergillus sección Flavi, ocho Aspergillus sección Fumigati, seis Aspergillus sección Nigri, cuatro Aspergillus sección Terrei y cuatro Aspergillus spp. Se preparó una suspensión al 0,5 MacFarland a partir de cultivos de 5 días de incubación de cada cepa de Aspergillus en agar Papa Dextrosa, que se inocularon posteriormente en placas de agar Sabouraud con glucosa al 2%. Los antifúngicos ensayados fueron: voriconazol (VCZ), anfotericina B (AMB), caspofungina (CAS) y posaconazol (PCZ). Posterior a la incubación a 35 °C, se determinó la Concentración Mínima Inhibitoria en μg/mL (CMI) para cada antifúngico a las 24 y 48 h. Se calculó el rango (R), media geométrica (MG), CMI50 y CMI90. Los resultados a las 24 h para las 33 cepas de Aspergillus fueron: VO (R = 0,031- 16; MG = 0,145; CMI 50 = 0,125 y CMI 90 = 0,5), AB (R=0,031-16; MG = 0,644; MIC50 = 0,5 y MIC90 = 8), CS (R = 0,031-16; MG = 0,1076; MIC50 = 0,063 y MIC90 = 1), PO (R =0,031 - 0,5; MG = 0,0755; MIC50 = 0,063 y MIC 90 = 0,25). Esta investigación permitió valorar los perfiles de susceptibilidad antifúngica en aislamientos clínicos de Aspergillus spp., mediante el método de Etest®, el cual es práctico, reproducible y fácil de realizar en los laboratorios de microbiología.

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Biografía del autor/a

Xiomara Moreno Calderón, Universidad Central de Venezuela. Caracas, Venezuela.

Microbiology Department, Bacteriology Facultad de Medicina, Escuela de Bioanálisis. Universidad Central de Venezuela. Instituto Médico La Floresta. Caracas, Venezuela.

Carolina Macero Estévez , Instituto Médico La Floresta. Caracas, Venezuela.

Microbiology Department. Instituto Médico La Floresta. Caracas, Venezuela.

Débora Oliveira Oliveira, Instituto Médico La Floresta. Caracas, Venezuela.

Microbiology Department. Instituto Médico La Floresta. Caracas, Venezuela.

Citas

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Publicado
2023-11-20
Cómo citar
Moreno Calderón, X., Macero Estévez , C., & Oliveira Oliveira, D. (2023). Antifungal susceptibility of Aspergillus genus determined by the Etest® method: eleven years of experience at the Instituto Médico La Floresta. Caracas, Venezuela.: Susceptibilidad a los antifúngicos del género Aspergillus determinada por el método Etest®: once años de experiencia en el Instituto Médico La Floresta. Caracas, Venezuela. Investigación Clínica, 64(4), 471-481. https://doi.org/10.54817/IC.v64n4a4
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