This report describes a case of invasive Exophiala dermatitidis infection after double lung transplantation in a 76-year-old man. After thoracotomy, the patient’s wound showed dehiscence with purulent secretion. The black yeast was isolated from cultures taken from the wound, and species identification was confirmed by sequence analysis of the internal transcribed spacer (ITS-S2) region. The results of the susceptibility testing showed voriconazole as the most active drug. Despite adaptation of the antifungal therapy the clinical condition worsened, and the patient died. In addition, we evaluated the fungicidal activity of antiseptics towards E. dermatitidis and aimed to provide a brief literature review of previously reported infections caused by this rare fungus. To the best of our knowledge, this is the first report of a rapidly progressing invasive fungal infection with E. dermatitidis originating from a colonized wound after lung transplantation.
Exophiala dermatitidis is a saprophytic black yeast-like fungus that rarely infects humans. It is commonly isolated from plant debris and soil and has been detected from indoor-habitats, e.g., dish washers, but also other places with high humidity . E. dermatitidis synthesizes melanin, giving its colonies a dark colour . The respiratory tract of patients with cystic fibrosis (CF) frequently is colonized with E. dermatitidis . The presence of E. dermatitidis triggers inflammatory responses was shown to cause significant airway infections  and thus seems to be associated with a more advanced state of disease. Additionally, Exophiala spp. frequently causes soft tissue infections known as phaeohyphomycosis , which also was described in case reports after lung transplantation [6, 7]. Infections of the central nervous system caused by E. dermatitidis are rare, mostly lethal, and have been described in a population of immunocompetent patients . Furthermore, there are reports of peritonitis caused by E. dermatitidis after continuous ambulatory peritoneal dialysis .
We herein present—to the best of our knowledge—the first clinical case of an invasive infection with E. dermatitidis in a patient presenting with a colonized wound after lung transplantation. Since the diagnosis and therapy of E. dermatitidis are very challenging, we aim to draw the attention of clinicians to this fungus in lung-transplant patients.
We report the case of a 76-year-old man who underwent double lung transplantation because of pulmonary fibrosis related to chronic obstructive pulmonary disease. The maintenance immunosuppressive regimen after transplantation included tacrolimus (0.1 mg/kg body weight) and prednisolone (15 mg/day, 50 mg/d–0.6 mg/kg on postoperative day followed by tapering). Ten days after surgery, the patient underwent rethoracotomy with left pneumonectomy due to haemorrhagic pleural effusion and subsequent respiratory failure. The antimicrobial prophylaxis after surgery included ciprofloxacin, piperacillin/tazobactam, cefepime, ceftolozane/tazobactam, ceftazidime/avibactam, meropenem, gentamicin, teicoplanin, linezolid and sulfametrole/trimethoprim which were administered due to colonization with methicillin-resistant Staphylococcus aureus, multidrug resistant Enterobacteriaceae as well as vancomycin resistant Enterococci. In addition, parenteral fluconazole (600 mg/day) and anidulafungin (100 mg/day) along with liposomal amphotericin B (10 mg/every 8 h) administered by inhalation were used for the prophylaxis of fungal infections. In the course of the following days, dehiscence of the thoracotomy wound with exudation of purulent material was noted (Fig. 1). Infection parameters were slightly elevated after transplantation, with a fluctuation range of 1.95–33.03 mg/dl for C-reactive protein, and 1.67–3.91 ng/ml for procalcitonin. The patient showed recurrent neutropenia; thus, filgrastim (48 Mio IU/day, s.c.) was regularly substituted. Nineteen culture samples showing growth of E. dermatitidis were isolated from the patient’s wound after transplantation. The swabs were cultured on Sabouraud (SAB) Gentamicin Chloramphenicol 2 agar (BioMerieux, Marcy l’Etoile, France), incubated for 72 h at 37 °C under aerobic conditions, and yielded grey yeast-like colonies. After 3 days, a colour change from grey to black was observed. The isolates were identified by the typical morphological appearance in conjunction with matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) analysis (Bruker Daltonics, Bremen, Germany) with the Bruker Biotyper (version 3.1 software), following the manufacturer’s protocol. Since the score value that could be achieved (1.6) was lower than the one defined in the manufacturer’s criteria (≥ 2.00) as acceptable for reliable species level identification, sequence analysis of the internal transcribed spacer (ITS-S2) region was performed additionally using the basic local alignment search tool (BLAST) algorithm (https://blast.ncbi.nlm.nih.gov/Blast.cgi) of the National Centre for Biotechnology Information (NCBI). Ninety-nine% similarity to E. dermatitidis strains ATCC 44504 (GenBank accession no. GU256756) and CBS 207.35 (GenBank accession no. NR121268) was observed, and the same species identification was achieved with the Westerdijk Fungal Biodiversity Institute database (http://www.westerdijkinstitute.nl, CBS 748.88).
Antimicrobial susceptibility assays for anidulafungin, fluconazole, posaconazole, itraconazole, voriconazole, amphotericin B and isavuconazole were performed using the antifungal broth microdilution (BMD) method described by the European Committee of Antimicrobial Susceptibility Testing (EUCAST) , the reference method established by the Clinical Laboratory Standards Institute (CLSI) , as well as the E-Test® (BioMerieux, Marcy l’Etoile, France) and MIC Test Strip® (Liofilchem, Roseto 45 degli Abruzzi (Te), Italy). The results are shown in Table 1.
Despite surgical treatment of the wound, the patient’s clinical condition deteriorated. Computed tomography scans of the chest showed further dehiscence of the surgical wound with swelling of the soft tissue and marginal storage of the contrast agent as a sign of superinfection on the left side. In addition, the remaining right-sided lung tissue showed small focal coin lesions with pleural effusion. At this stage, cultures from the pleural fluid also revealed growth of E. dermatitidis indicating the development of an invasive fungal infection. The clinical condition did not improve even though the therapy was switched to voriconazole (300 mg/every 12 h), which might be due to the advanced stage of the infection. The patient died 3 days after adapting the antifungal therapy.
To identify the origin of the colonization and possible transmission routes, samples from the patients’ environment at the intensive care unit—including the sink drain and the rubber seal and drain from the dishwasher located in the kitchen as well as sink drains located in the patients’ rooms—were taken using sterile liquid transport swab systems (eSwab™, Hain Lifescience, Nehren, Germany). The swabs were rubbed over the surface of SAB Gentamicin Chloramphenicol 2 agar plates (BioMerieux, Marcy l’Etoile, France) and Sabouraud dextrose broth supplemented with gentamicin, which were then incubated at 37 °C for up to 3 weeks. None of the samples showed growth of E. dermatitidis.
Quantitative Suspension Test for the Evaluation of Basic Fungicidal Activity of Antiseptics According to EN1275
C. albicans ATCC 10231 as well as the clinical isolate E. dermatitidis were tested according to EN1275 . The EN1275 Quantitative Suspension Test is designed to evaluate the basic fungicidal activity of chemical disinfectants and antiseptics under various conditions and was applied for the following products: (i) povidone-iodine solution, containing 10 g povidone-iodine complex in 100 ml water solution yielding 11% available iodine—Betaisodona® (Mundipharma GmbH, Vienna, Austria); (ii) polyhexanide 0.4%—Lavasorb® (Fresenius Kabi AG, Bad Homburg, Germany); (iii) Octenidine dihydrochloride 0.1%—Octenisept® (Schülke & Mayr GmbH, Norderstedt, Germany), (iv) hydrogen peroxide solution 3% and alcohol-based disinfectants used in our hospital for hand antisepsis containing Propan-2-ol 45.0 g, Propan-1-ol 30.0 g, Mecetronium etilsulphate 0.2 g—Sterillium® (Paul-Hartmann AG, Heidenheim, Germany). All products were tested at the following concentrations: 80, 50 and 20%; the antiseptics were dissolved in water. The test organisms were diluted in a tryptone sodium chloride solution. An exposure time of 15 min was considered. Sufficient fungicidal activity can be assumed if an at least 4 log reduction in colony growth is observed after an exposure time no longer than 15 min. According to EN 1275, the recommended incubation time for C. albicans ATCC 10231 is 48 h and is 48 h (+ 24 h) for Aspergillus niger ATCC 16404 at 30 °C after spreading the suspension on malt extract agar. As there is no recommendation for the testing of other species, for E. dermatitidis a reading was performed every 24 h up to 3 weeks.
No growth was observed if E. dermatitidis and C. albicans were exposed to povidone-iodine, polyhexanide, octenidine dihydrochloride and alcohol-based disinfectants. However, even the highest concentration of the hydrogen peroxide solution did not inhibit the growth of E. dermatitidis or C. albicans.
Infections with Exophiala spp. are rare in humans [13,14,15]. E. dermatitidis, E. xenobiotica and E. oligosperma are the most common species . In the US, these three species are responsible for approximately two-thirds of infections. In vivo tests in immunocompromised mice showed a higher virulence of E. dermatitidis compared to E. xenobiotica and E. oligosperma . Furthermore, E. dermatitidis is the only neurotropic species and thus can cause infections of the central nervous system (CNS).
In clinical microbiology, the identification of Exophiala is challenging. The use of MALDI-TOF—a well-established method for the identification of bacteria and yeasts—is limited by the fact that databases used in clinical routine do not necessarily include Exophiala spp. . Our database for example contains only limited spectra for E. dermatitidis; thus, only a low score could be achieved when using MALDI-TOF for the identification of our strain of E. dermatitidis. With updated MALDI-TOF databases, MALDI-TOF detection of Exophiala spp. would yield to more reliable results [18, 19].
The gold standard for the identification of Exophiala spp. is to sequence the internal transcribed spacer (ITS) regions 1 (ITS 1) and 2 (ITS 2) [20, 21]. In our case, sequence analysis of the ITS 2 region confirmed the identification of the isolated strain.
Standardized procedures for susceptibility testing or treatment regimens are not published, although literature suggests that Exophiala spp. usually are susceptible to voriconazole [5, 22], whereas in vitro resistance to echinocandins and fluconazole was observed .
According to CLSI and EUCAST, the BMD method is the gold standard for antifungal susceptibility testing for yeasts [10, 11, 24, 25]. However, the less labour intensive E-Test has been demonstrated to be a convenient alternative. Szekely et al. tested 10 isolates of E. dermatitidis with both methods and showed a 90% agreement (within ± 2 log2 dilutions) of the two methods for itraconazol, while results for amphotericin B only were in agreement in 70% of the tests . Although the sample size in this study was limited, E-Test seems to be an acceptable alternative, even though results obtained for amphotericin B suggest that the BMD method might provide more reliable results.
In patients with localized soft tissue infection caused by E. dermatitidis itraconazole in a single-substance-regime frequently led to healing [29, 30]. In the literature, only a small number of CNS infections are published. Those generally are associated with a high mortality rate, and a long-course antifungal chemotherapy is necessary [14, 31]. If involvement of the CNS is suspected, antifungal substances that reach acceptable concentrations in cerebrospinal fluid (CSF)—such as voriconazole—should be selected. A report of the Centres for Disease Control and Prevention described four cases of meningitis caused by E. dermatitidis after epidural injections of methylprednisolone and one of these patients was cured with long-term voriconazole-therapy . In murine models, posaconazole showed the best efficacy [33, 34].
Pulmonary infections with Exophiala spp. are frequently associated with CF or immunodeficiency. In patients without CF, long-term therapy with itraconazole or voriconazole (up to 7 months) usually is successful [35, 36] In patients with CF, Exophiala spp. seem to be under-diagnosed colonizers of the lower respiratory tract . In a prospective study published by Lebecque et al., 5.8% of CF patients had at least one Exophiala-positive sputum-culture . Further reports on the prevalence of E. dermatitidis in CF patients suggest a range from 1% in Germany to around 20% in Sweden [3, 39]. Possible risk factors identified were age > 12 years and pancreatic insufficiency . Despite the high prevalence of E. dermatitidis in CF patients, and the potential association with disease progression, recommendations in regard to therapy or prophylaxis in those patients are missing. Only a small number of case reports suggested an extended course of voriconazole or itraconazole administration in CF patients with worsening pulmonary symptoms and persistent detection of E. dermatitidis in sputum cultures [40,41,42].
To date, no data about the antiseptic susceptibility of Exophiala spp. have been published. Therefore, in order to assess the efficacy of antiseptics, we conducted a phase 1 test according to EN1275. Our test results showed inhibition of growth—and thus fungicidal activity, for all tested antiseptics with the exception of hydrogen peroxide, which is still frequently used for wound antisepsis during surgery in our hospital. It is, however, essential to consider that organic matter or blood secreted by wounds might interfere with the fungicidal activity of antiseptics in vivo, and that in vitro activity does not guarantee that the tested antiseptic solutions will be effective under conditions representative for wounds. Shortly after, we performed our experiments, alternative methods like the phase 2/step 2 in vitro test, which is based on EN 14561, have been proposed for this application . Thus, our preliminary results have to be confirmed in a more detailed set of experiments.
In transplant patients, E. dermatitidis mostly causes phaeohyphomycosis usually presenting with nodules containing abscesses or cysts underneath the skin [44, 45]. These clinical features were also evident in two case reports describing E. jeanselmei phaeohyphomycosis in lung-transplant patients [6, 7]. In contrast to our case, those infections appeared years after lung transplantation and could be cured by surgical excision with or without antifungal therapy. To the best of our knowledge, the case presented herein is the first case describing the presence of the fungus in pleural fluid.
Evidence concerning transmission routes in the hospital setting is scarce. A nosocomial outbreak of E. jeanselmei fungemia related to contaminated deionized water from the pharmacy has been described . In our case, it was not possible to identify the source of infection. We assume that the disregarded colonization with E. dermatitidis was the reason for the development of the invasive fungal infection. However, further research is needed to reveal sources and possible transmission routes of these organisms in the hospital setting.
In summary, E. dermatitidis colonization can rapidly progress towards an invasive fungal infection. In addition, the detection and identification of this slow growing fungus represent a challenge for the microbiology laboratory, which might lead to delayed—or failed—treatment. Patients at risk, for example, are CF patients colonized by E. dermatitidis, as well as immunocompromised patients.
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Open access funding provided by Medical University of Vienna. The authors are especially thankful to Kathrin Spettel for excellent technical assistance. Special thanks are owed to Iris Zeller and Jeremy V. Camp for linguistic advice and revision.
This work was supported by internal funding.
Conflicts of interest
The authors declare that they have no conflict of interest.
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Klasinc, R., Riesenhuber, M., Bacher, A. et al. Invasive Fungal Infection Caused by Exophiala dermatitidis in a Patient After Lung Transplantation: Case Report and Literature Review. Mycopathologia 184, 107–113 (2019). https://doi.org/10.1007/s11046-018-0275-4
- Exophiala dermatitidis
- Lung transplantation
- Invasive infection