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Shiomi I, Makuuchi Y, Noura I, Kakuno S, Niki M, Kaimi Y, Ido K, Sakatoku K, Kuno M, Takakuwa T, Okamura H, Nishimoto M, Nakashima Y, Nakamae M, Kakeya H, Kohashi K, Hino M, Nakamae H. Invasive fungal infection caused by Blastobotrys mokoenaii in an immunocompromised patient with acute myeloid leukemia: A case report. J Infect Chemother 2024; 30:557-561. [PMID: 38092335 DOI: 10.1016/j.jiac.2023.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 11/26/2023] [Accepted: 12/02/2023] [Indexed: 12/21/2023]
Abstract
Blastobotrys is a genus of rare yeast that is increasingly recognized as a cause of fungal infections in humans. However, there have been no reports of fungal infections in humans caused by Blastobotrys mokoenaii. We describe a case of invasive fungal infection (IFI) caused by B. mokoenaii in an immunocompromised patient with acute myeloid leukemia (AML). A 46-year-old man with relapsed/refractory AML underwent a second allogeneic peripheral blood hematopoietic stem cell transplantation (allo-PBSCT) during remission. The patient had prolonged neutropenia and received systemic steroid therapy for graft-versus-host disease before the second allo-PBSCT. Uncommon yeast was isolated from the blood cultures obtained on day 4. We initially suspected that the uncommon yeast was Trichosporon spp. based on its morphology. However, unlike Trichosporon spp., in vitro antifungal susceptibility tests showed that this yeast isolate was resistant to micafungin, caspofungin, voriconazole, itraconazole, and fluconazole. We performed DNA sequencing and identified it as B. mokoenaii. B. mokoenaii was persistently isolated from blood cultures taken during combination therapy with liposomal amphotericin B and voriconazole. The patient died of multiorgan failure on day 24. B. mokoenaii can cause severe IFI in immunocompromised patients; however, it may not be correctly identified by routine clinical microbiology testing in a hospital laboratory and DNA sequencing is useful for diagnosis.
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Affiliation(s)
- Ichiro Shiomi
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Yosuke Makuuchi
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan.
| | - Ikue Noura
- Department of Diagnostic Pathology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Shigeki Kakuno
- Department of Infection Control and Prevention, Osaka Metropolitan University Hospital, Osaka, Japan; Department of Infection Control Science, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Makoto Niki
- Department of Infection Control and Prevention, Osaka Metropolitan University Hospital, Osaka, Japan
| | - Yuto Kaimi
- Department of Diagnostic Pathology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Kentaro Ido
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan; Department of Laboratory Medicine and Medical Informatics, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Kazuki Sakatoku
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Masatomo Kuno
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Teruhito Takakuwa
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Hiroshi Okamura
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Mitsutaka Nishimoto
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Yasuhiro Nakashima
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Mika Nakamae
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan; Department of Laboratory Medicine and Medical Informatics, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Hiroshi Kakeya
- Department of Infection Control and Prevention, Osaka Metropolitan University Hospital, Osaka, Japan; Department of Infection Control Science, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Kenichi Kohashi
- Department of Diagnostic Pathology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Masayuki Hino
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
| | - Hirohisa Nakamae
- Department of Hematology, Osaka Metropolitan University Graduate School of Medicine, Osaka, Japan
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Al-Obaidi M, Badali H, Cañete-Gibas C, Patterson HP, Wiederhold NP. Pulmonary infection secondary to Blastobotrys raffinosifermentans in a cystic fibrosis patient: Review of the literature. Mycoses 2021; 64:616-623. [PMID: 33555073 DOI: 10.1111/myc.13252] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 02/02/2021] [Accepted: 02/03/2021] [Indexed: 12/27/2022]
Abstract
BACKGROUND The genus Blastobotrys consists of at least 20 species. Disease in humans has been reported with B adeninivorans, B raffinosifermentans, B proliferans and B serpentis, mostly in immunocompromised patients and those with cystic fibrosis. OBJECTIVE We report a lung infection secondary to B raffinosifermentans in a cystic fibrosis patient successfully treated with isavuconazole and review the literature of invasive infections caused this genus. We also evaluated clinical isolates in our laboratory for species identification and antifungal susceptibility. METHODS Phylogenetic analysis was performed on a collection of 22 Blastobotrys isolates in our reference laboratory, and antifungal susceptibility patterns were determined for nine clinically available antifungals against 19 of these isolates. RESULTS By phylogenetic analysis, 21 of the 22 isolates in our collection were identified as B raffinosifermentans and only 1 as B adeninivorans. Most were cultured from the respiratory tract, although others were recovered from other sources, including CSF and blood. Isavuconazole, caspofungin and micafungin demonstrated the most potent in vitro activity, followed by amphotericin B. In contrast, fluconazole demonstrated poor activity. The patient in this case responded to isavuconazole treatment for breakthrough infection due to B raffinosifermentans that was cultured from pleural fluid while on posaconazole prophylaxis post-bilateral lung transplantation for cystic fibrosis. CONCLUSIONS Blastobotrys species are rare causes of infections in humans and primarily occur in immunocompromised hosts. In our collection, the majority of isolates were identified as B raffinosifermentans. To our knowledge, this is the first report of successful treatment of such an infection with isavuconazole.
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Affiliation(s)
| | - Hamid Badali
- Fungus Testing Laboratory, Department of Pathology and Laboratory Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA.,Invasive Fungi Research Center, Communicable Diseases Institute, Mazandaran University of Medical Sciences, Sari, Iran
| | - Connie Cañete-Gibas
- Fungus Testing Laboratory, Department of Pathology and Laboratory Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Hoja P Patterson
- Fungus Testing Laboratory, Department of Pathology and Laboratory Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Nathan P Wiederhold
- Fungus Testing Laboratory, Department of Pathology and Laboratory Medicine, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
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Graham J, Nataatmadja M, Romney M, Jamal A. Diaporthe and Blastobotrys fungal peritonitis in returned travellers receiving peritoneal dialysis. Perit Dial Int 2020; 40:239. [DOI: 10.1177/0896860819892741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Judi Graham
- Division of Nephrology, St Paul’s Hospital, Vancouver, Canada
| | | | - Marc Romney
- Division of Microbiology, St Paul’s Hospital, Vancouver, Canada
- University of British Columbia, Vancouver, Canada
| | - Abeed Jamal
- Division of Nephrology, St Paul’s Hospital, Vancouver, Canada
- University of British Columbia, Vancouver, Canada
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Invasive mycosis due to species of Blastobotrys in immunocompromised patients with reduced susceptibility to antifungals. J Clin Microbiol 2014; 52:4094-9. [PMID: 25165080 DOI: 10.1128/jcm.01977-14] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cases of invasive mycosis due to Blastobotrys serpentis and B. proliferans identified by sequencing in a preterm patient and a rhabdomyosarcoma patient, respectively, are reported. Both species revealed elevated fluconazole and echinocandin MICs by the CLSI broth microdilution method. Additionally, B. serpentis exhibited high amphotericin B MICs, thus posing serious therapeutic challenges.
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Wong JY, Chambers AL, Fuller J, Lacson A, Mullen J, Lien D, Humar A. Successful lung transplant in a child with cystic fibrosis and persistent Blastobotrys rhaffinosifermentans infection. Pediatr Transplant 2014; 18:E169-73. [PMID: 24930454 DOI: 10.1111/petr.12294] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/24/2014] [Indexed: 11/30/2022]
Abstract
Fungal respiratory infections in patients with CF are a significant concern both pre- and post-lung transplantation (LTx). Fungal infection is associated with increased mortality post-LTx, and in the past decade, the prevalence of fungal colonization in Canadian pediatric patients with CF has increased. The emergence of novel fungal pathogens is particularly challenging to the transplant community, as little is known regarding their virulence and optimal management. We present a case of a successful double-lung transplant in a pediatric patient with CF who was infected pretransplantation with a novel yeast, Blastobotrys rhaffinosifermentans. This patient was treated successfully with aggressive antifungal therapy post-transplantation, followed by extended fungal prophylaxis. The significance of fungal colonization and infection in children with CF pre- and post-LTx is reviewed.
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Affiliation(s)
- J Y Wong
- University of Alberta, Edmonton, AB, Canada
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Molecular identification of veterinary yeast isolates by use of sequence-based analysis of the D1/D2 region of the large ribosomal subunit. J Clin Microbiol 2010; 48:2140-6. [PMID: 20392917 DOI: 10.1128/jcm.02306-09] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Conventional methods of yeast identification are often time-consuming and difficult; however, recent studies of sequence-based identification methods have shown promise. Additionally, little is known about the diversity of yeasts identified from various animal species in veterinary diagnostic laboratories. Therefore, in this study, we examined three methods of identification by using 109 yeast samples isolated during a 1-year period from veterinary clinical samples. Comparison of the three methods-traditional substrate assimilation, fatty acid profile analysis, and sequence-based analysis of the region spanning the D1 and D2 regions (D1/D2) of the large ribosomal subunit-showed that sequence analysis provided the highest percent identification among the three. Sequence analysis identified 87% of isolates to the species level, whereas substrate assimilation and fatty acid profile analysis identified only 54% and 47%, respectively. Less-stringent criteria for identification increased the percentage of isolates identified to 98% for sequence analysis, 62% for substrate assimilation, and 55% for fatty acid profile analysis. We also found that sequence analysis of the internal transcribed spacer 2 (ITS2) region provided further identification for 36% of yeast not identified to the species level by D1/D2 sequence analysis. Additionally, we identified a large variety of yeast from animal sources, with at least 30 different species among the isolates tested, and with the majority not belonging to the common Candida spp., such as C. albicans, C. glabrata, C. tropicalis, and the C. parapsilosis group. Thus, we determined that sequence analysis of the D1/D2 region was the best method for identification of the variety of yeasts found in a veterinary population.
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