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The introduction of the prophylactic use of antifungal drugs caused the increased occurrence of invasive fungal infections due to previously rare molds, such as fusariosis, after allogeneic hematopoietic stem cell transplantation. We herein report the case of a patient with diffuse large B-cell lymphoma who developed fungemia due to Fusarium solani during liposormal amphotericin B on day 25 after cord blood transplantation (CBT). Because Fusarium species might differ in virulence and drug susceptibility, the sequencing of the internal transcribed spacer region of the ribosomal RNA gene accurately identified Fusarium solani to be the cause of fungemia at the species level. This case highlights Fusarium solani as the cause of fungemia in a patient under liposormal amphotericin B treatment after CBT.

Two achlorophyllous microalgal strains were isolated from the soil and white moldy colony collected inside the stone chamber of the Takamatsuzuka Tumulus in Japan. Phylogenetic analyses of the small subunit ribosomal RNA (SSU rRNA) and Dl/D2 large subunit ribosomal RNA (LSU rRNA) gene sequences, and concatenated gene sequences of the SSU and D1/D2 LSU rRNA genes indicated that our two isolates were the members of the non-photosynthetic, yeast-like microalgal Chlorellaceous genus Prototheca (Chlorellales, Trebouxiophyceae, Chlorophyta) but well distinguished from known species. Based on phenotypic and genotypic characteristics, isolates T6713-13-10T and T61213-7-11 are proposed to represent a novel species in Prototheca, P. tumulicola, with the type strain JCM 31123T (isolate T6713-13-10T).

Microbial outbreaks and related biodeterioration problems have affected the 1300-year-old multicolor (polychrome) mural paintings of the special historic sites Takamatsuzuka Tumulus (TT) and Kitora Tumulus (KT). Those of TT are designated as a national treasure. The microbiomes of these tumuli, both located in Asuka village, Nara, Japan, are critically reviewed as the central subject of this report. Using culture-dependent methods (conventional isolation and cultivation), we conducted polyphasic studies of the these microbial communities and identified the major microbial colonizers (Fusarium spp., Trichoderma spp., Penicillium spp., dark Acremonium spp., novel Candida yeast spp., Bacillus spp., Ochrobactrum spp., Stenotrophomonas tumulicola, and a few actinobacterial genera) and noteworthy microbial members (Kendrickiella phycomyces, Cephalotrichum verrucisporum (≡Doratomyces verrucisporus), Sagenomella striatispora, Sagenomella griseoviridis, two novel Cladophialophora spp., Burgoa anomala, one novel species Prototheca tumulicola, five novel Gluconacetobacter spp., three novel Bordetella spp., and one novel genus and species Krasilnikoviella muralis) involved in the biodeterioration of mural paintings, plaster walls, and stone chamber interiors. In addition, we generated microbial community data from TT and KT samples using culture-independent methods (molecular biological methods, including PCR-DGGE, clone libraries, and pyrosequence analysis). These data are comprehensively presented, in contrast to those derived from culture-dependent methods. Furthermore, the microbial communities detected using both methods are analytically compared, and, as a result, the complementary roles of these methods and approaches are highlighted. In related contexts, knowledge of similar biodeterioration problems affecting other prehistoric cave paintings, mainly at Lascaux in France and Altamira in Spain, are referred to and commented upon. Based on substrate preferences (or ecological grouping) and mapping (plotting detection sites of isolates), we speculate on the possible origins and invasion routes whereby the major microbial colonizers invaded the TT stone chamber interior. Finally, concluding remarks, lessons, and future perspectives based on our microbiological surveys of these ancient tumuli, and similar treasures outside of Japan, are briefly presented. A list of the microbial taxa that have been identified and fully or briefly described by us as known and novel taxa for TT and KT isolates since 2008 is presented in Supplementary Materials.

Analysis of D1/D2 large-subunit (LSU) rRNA gene sequences predicted that 17 yeast isolates, mainly from viscous gels (biofilms) taken from the stone chamber interior of the Kitora tumulus in Nara, Japan, were placed in the Yamadazyma and Zygoascus clades. Polyphasic characterization, including morphological, physiological and chemotaxonomic characteristics, multigene sequence divergence and DNA-DNA hybridization, strongly suggested the assignment of one novel species to each of the clades; these are Yamadazyma kitorensis f.a., sp. nov., with the type strain JCM 31005T (ex-type CBS 14158T=isolate K8617-6-8T), and Zygoascus biomembranicola f.a., sp. nov., with the type strain JCM 31007T (ex-type CBS 14157T=isolate K61208-2-11T). Furthermore, the transfer of five known species of the genus Candida as novel combinations to the genera Yamadazyma and Zygoascus is proposed; these are Yamadazyma olivae f.a., comb. nov. (type strain CBS 11171T=ATCC MYA-4568T), Yamadazyma tumulicola f.a., comb. nov. (type strain JCM 15403T=ex-type CBS 10917T=isolate T6517-9-5T), Yamadazyma takamatsuzukensis f.a., comb. nov. (type strain JCM 15410T=CBS 10916T = isolate T4922-1-1T), Zygoascus polysorbophila f.a., comb. nov. (type strain NRRL Y-27161T=CBS 7317T) and Zygoascus bituminiphila f.a., comb. nov. (type strain CBS 8813T=MUCL 41424T).

The prophylactic use of antifungal drugs in allogeneic hematopoietic cell transplant recipients has revealed that the rate of non-albicans candidemia has increased. We herein report the case of a patient with adult T-cell leukemia who developed candidemia due to Candida fermentati during micafungin treatment after cord blood transplantation. The isolate was identified on day 47 by sequencing of the internal transcribed spacer region of the ribosomal RNA gene. The sequencing of the hot spot region of fks1p of isolate revealed naturally occurring amino acid substitutions, which conferred reduced echinocandin susceptibility. This case highlights that breakthrough candidemia due to C. fermentati occurred in a patient receiving micafungin treatment. This article is protected by copyright. All rights reserved.