AUTHOR=Trovato Laura , Oliveri Salvatore , Esposto Maria Carmela , Prigitano Anna , Romanò Luisa , Cogliati Massimo 

TITLE=Cryptococcus neoformans and Cryptococcus gattii Species Complex Isolates on the Slopes of Mount Etna, SICILY, Italy

JOURNAL=Frontiers in Microbiology

VOLUME=10

YEAR=2019

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2019.02390

DOI=10.3389/fmicb.2019.02390

ISSN=1664-302X

ABSTRACT=<p>This study investigated the presence of <italic>Cryptococcus neoformans</italic> and <italic>Cryptococcus gattii</italic> species complex isolates on olive trees growing in the Eastern part of Sicily (Italy) characterized by the presence of the volcano Etna and the ability of these fungal pathogens to sexually reproduce on medium containing volcanic soil. Samples from 124 olive trees were collected from 14 different sites around Mount Etna. Eighteen trees (14.5%) resulted colonized by <italic>C. neoformans</italic> VNI-αA isolates, one (0.8%) by VNIV-αD isolates, and two (1.6%) by <italic>C. gattii</italic> VGI-αB isolates. The ability of environmental and reference strains belonging to VNI, VNIV, and VGI molecular types to sexually reproduce on a medium containing volcanic soil was also tested. VNI and VNIV strains were able to produce filaments and basiodiospores more vigorously than on the control medium, whereas VGI strains were not fertile. In conclusion, the present study identified which <italic>C. neoformans</italic> and <italic>C. gattii</italic> species complex genotypes are circulating in Eastern Sicily and confirmed the ecological role of olive trees as environmental reservoir of these pathogens. It also showed that <italic>Cryptococcus</italic> is able to colonize and sexually reproduce in inhospitable environments such as the slopes of a volcano.</p>