We aim to assess intra- and interspecies differences in the virulence of Candida spp. strains causing candidemia using the invertebrate Galleria mellonella model. We studied 739 Candida spp. isolates (C. albicans [n = 373], C. parapsilosis [n = 203], C. glabrata [n = 92], C. tropicalis [n = 53], and C. krusei [n = 18]) collected from patients with candidemia admitted to Gregorio Marañon Hospital (Madrid, Spain). Species-specific infecting inocula (yeast cells/larva) were adjusted (5 × 105 [C. albicans, and C. tropicalis], 2 × 106-5 × 106 [C. parapsilosis, C. glabrata, and C. krusei]) and used to infect 10 larvae per isolate; percentage of survival and median survival per isolate were calculated. According to the interquartile range of the median survival, isolates with a median survival under P25 were classified as of high-virulence and isolates with a median survival over P75 as of low virulence. The median survival of larvae infected with different species was variable: C. albicans (n = 2 days, IQR <1-3 days), C. tropicalis (n = 2 days, IQR 1.5-4 days), C. parapsilosis (n = 2 days, IQR 2-3.5 days), C. glabrata (n = 3 days, IQR 2-3 days), and C. krusei (n = 7 days, 6.5->8 days) (P < .001). Differences in virulence among species were validated by histological examination (day +1 post-infection) in the larvae infected by the isolates of each virulence category and species. Virulence-related gene expression in C. albicans isolates did not reach statistical significance. We report species-specific virulence patterns of Candida spp. and show that isolates within a given species have different degrees of virulence in the animal model.
Candida isolates causing candidemia show different degrees of virulence in Galleria mellonella / L.J. Marcos-Zambrano, M.Á. Bordallo-Cardona, E. Borghi, M. Falleni, D. Tosi, P. Muñoz, P. Escribano, J. Guinea. - In: MEDICAL MYCOLOGY. - ISSN 1369-3786. - 58:1(2020 Jan), pp. 83-92.
|Titolo:||Candida isolates causing candidemia show different degrees of virulence in Galleria mellonella|
|Parole Chiave:||Candida albicans; Candida glabrata; Candida krusei; Candida parapsilosis; Candida tropicalis; Galleria mellonella|
|Settore Scientifico Disciplinare:||Settore MED/08 - Anatomia Patologica|
|Data di pubblicazione:||gen-2020|
|Data ahead of print / Data di stampa:||15-gen-2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1093/mmy/myz027|
|Appare nelle tipologie:||01 - Articolo su periodico|