Resumen de Postantifungal effect of anidulafungin against Candida albicans, Candida dubliniensis, Candida africana, Candida parapsilosis, Candida metapsilosis and Candida orthopsilosis

Sandra Gil Alonso, Guillermo Quindós Andrés, Elena Eraso Barrio, Nerea Jauregizar Albonigamayor

• English

  Objectives. Candida albicans remains the most common aetiology of invasive candidiasis, leading to high morbidity and mortality. Nevertheless, the incidence of candidiasis due to non-C. albicans species, such as Candida parapsilosis, is increasing. Postantifungal effect (PAFE) is relevant for establishing dosage schedules in antifungal therapy, as the frequency of antifungal administration could change depending on PAFE. The aim of this study was to evaluate the PAFE of anidulafungin against C. albicans, Candida dubliniensis, Candida africana, C. parapsilosis, Candida metapsilosis and Candida orthopsilosis.

  Material and methods. Twenty-one Candida strains were evaluated. Cells were exposed to anidulafungin for 1 h at concentrations ranging from 0.12 to 8 mg/L for PAFE studies.

  Time-kill experiments (TK) were conducted at the same concentrations. The experiments were performed using an inoculum of 1-5 x 105 cells/mL and 48 h incubation. Readings of PAFE and TK were done at 0, 2, 4, 6, 24 and 48 h.

  Results. Anidulafungin was fungicidal against 2 out of 14 (14%) strains of C. albicans related species in PAFE experiments. Moreover, 2 mg/L of anidulafungin exerted a prolonged PAFE (≥ 33.6 h) against 13 out of 14 (93%) strains. Similarly, fungicidal endpoint was achieved against 1 out of 7 (14%) strains of C. parapsilosis complex, being PAFE prolonged (≥ 42 h) against 6 out of 7 (86%) strains.

  Conclusions. Anidulafungin induced a significant and prolonged PAFE against C. albicans and C. parapsilosis and their related species.

• English

  Objetivos. Candida albicans continúa siendo la causa más frecuente de candidiasis invasiva; sin embargo, la incidencia de candidiasis causadas por especies diferentes a C. albicans, como Candida parapsilosis, está aumentando. El efecto postantifúngico (PAFE) es relevante para establecer pautas de dosificación en la terapia antifúngica, ya que la frecuencia de administración de los fármacos antifúngicos podría cambiar dependiendo del PAFE. El objetivo de este estudio fue evaluar el PAFE de anidulafungina contra C. albicans, Candida dubliniensis, Candida africana, C. parapsilosis, Candida metapsilosis y Candida orthopsilosis.

  Material y métodos. Se evaluaron 21 cepas de Candida. Para llevar a cabo los estudios PAFE, las células se expusieron durante 1 h a concentraciones entre 0,12 y 8 mg/L de anidulafungina. Las curvas de letalidad (TK) se obtuvieron empleando las mismas concentraciones. Los experimentos se realizaron utilizando un inóculo de 1-5 x 105 células/mL, durante 48 h de incubación. Las lecturas de PAFE y TK se realizaron a las 0, 2, 4, 6, 24 y 48 h.

  Resultados. Anidulafungina, en los experimentos PAFE, fue fungicida contra 2 de 14 (14%) cepas de las especies relacionadas con C. albicans y ejerció un PAFE prolongado (≥ 33,6 h) contra 13 de 14 (93%) cepas (2 mg/L). El límite fungicida de anidulafungina se alcanzó contra 1 de 7 (14%) cepas del complejo C. parapsilosis, con un PAFE prolongado (≥ 42 h) contra 6 de 7 (86%) cepas.

  Conclusiones. Anidulafungina produce un PAFE significativo y prolongado contra C. albicans y C. parapsilosis y las especies relacionadas con estas.