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Fatal breakthrough infection with Fusarium andiyazi: New multi-resistant aetiological agent cross-reacting with Aspergillus galactomannan enzyme immunoassay

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Disseminated infections caused by members of the Fusarium fujikuroi species complex (FFSC) occur regularly in immunocompromised patients. Here, we present the first human case caused by FFSC-member Fusarium andiyazi. Fever, respiratory symptoms and abnormal computerised tomography findings developed in a 65-year-old man with acute myelogenous leukaemia who was under posaconazole prophylaxis during his remission-induction chemotherapy. During the course of infection, two consecutive blood galactomannan values were found to be positive, and two blood cultures yielded strains resembling Fusarium species, according to morphological appearance. The aetiological agent proved to be F. andiyazi based on multilocus sequence typing. The sequencing of the internal transcribed spacer region did not resolve the closely related members of the FFSC, but additional data on partial sequence of transcription elongation factor 1 alpha subunit did. A detailed morphological study confirmed the identification of F. andiyazi, which had previously only been reported as a plant pathogen affecting various food crops.
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Case report
Fatal breakthrough infection with Fusarium andiyazi: new
multi-resistant aetiological agent cross-reacting with Aspergillus
galactomannan enzyme immunoassay
Nesrin Kebabcı,
1
Anne D. van Diepeningen,
2
Beyza Ener,
3
Tuba Ersal,
4
Martin Meijer,
2
Abdullah M.S. Al-Hatmi,
2
Vildan
Ozkocaman,
4
Ahmet Ursavas
ß,
5
Ezgi D. C
ßetino
glu
5
and
Halis Akalın
1
1
Faculty of Medicine, Department of Clinical Microbiology and Infectious Diseases, Uluda
g University, Bursa, Turkey,
2
CBS-KNAW Fungal Biodiversity
Centre, Utrecht, The Netherlands,
3
Faculty of Medicine, Department of Medical Microbiology, Uluda
g University, Bursa, Turkey,
4
Faculty of Medicine,
Department of Heamatology, Uluda
g University, Bursa, Turkey and
5
Faculty of Medicine, Department of Chest Diseases, Uluda
g University, Bursa, Turkey
Summary Disseminated infections caused by members of the Fusarium fujikuroi species complex
(FFSC) occur regularly in immunocompromised patients. Here, we present the first
human case caused by FFSC-member Fusarium andiyazi.Fever, respiratory symp-
toms and abnormal computerised tomography findings developed in a 65-year-old
man with acute myelogenous leukaemia who was under posaconazole prophylaxis
during his remissioninduction chemotherapy. During the course of infection, two
consecutive blood galactomannan values were found to be positive, and two blood
cultures yielded strains resembling Fusarium species, according to morphological
appearance. The aetiological agent proved to be F. andiyazi based on multilocus
sequence typing. The sequencing of the internal transcribed spacer region did not
resolve the closely related members of the FFSC, but additional data on partial
sequence of transcription elongation factor 1 alpha subunit did. A detailed morpho-
logical study confirmed the identification of F. andiyazi, which had previously only
been reported as a plant pathogen affecting various food crops.
Key words: Acute leukaemia, posaconazole prophylaxis, Fusarium andiyazi,Fusarium fujikuroi species complex,
galactomannan, breakthrough infections.
Introduction
Fusarium species are ubiquitous in soil and plant deb-
ris. They are also important plant pathogens and in
recent years have emerged as pathogens affecting both
immunocompetent and immunocompromised human
hosts. In the first patient group Fusarium infections
tend to be superficial or locally invasive, and present
themselves as for example, onychomycosis, paronychia
and keratitis. In the group of the immunocompromised
patients, the infections like sinusitis, pulmonary and
haematogenously disseminated infections tend to be
uncommonly severe. The most frequent Fusarium spe-
cies isolated from clinical specimens are F. solani,F.
oxysporum, and F. verticillioides.
13
Patients with acute myelogenous leukaemia (AML)
or myelodysplastic syndrome (MDS) and neutropenia
after remissioninduction chemotherapy have a high
risk of fatal invasive fungal infections (IFI).
4,5
Mortal-
ity rates resulting from candidiasis or aspergillosis are
reported to reach 40%50%, while those from fusari-
osis or zygomycosis can reach 70% or higher.
69
In a
randomised clinical trial, posaconazole (POS) has been
shown to prevent IFIs more effectively than either
fluconazole (FLU) or itraconazole (ITR) and to
improve overall survival in patients undergoing
Correspondence: Beyza Ener, Uluda
g University, Faculty of Medicine,
Department of Medical Microbiology, 16059 G
or
ukle Bursa Turkey.
Tel.: +90 224 442 9156. Fax: +90 224 295 4149.
E-mail: bener@uludag.edu.tr
Submitted for publication 14 June 2013
Revised 2 September 2013
Accepted for publication 3 September 2013
©2013 Blackwell Verlag GmbH doi:10.1111/myc.12142
mycoses
Diagnosis, Therapy and Prophylaxis of Fungal Diseases
chemotherapy for AML or MDS.
4
The prophylactic
use of POS (600 mg day
1
) during remissioninduc-
tion chemotherapy in AML patients is widely accepted
in most countries.
Detection of Aspergillus galactomannan (GM) using
the Platelia Aspergillus antigen immunoassay (BioRad
Laboratories, Marnes-la-Coquette, France) is one of the
microbiological criteria for the diagnosis of invasive
aspergillosis.
10,11
Although GM tests are considered
highly sensitive and specific for Aspergilli in patients,
cross-reactivity with other moulds like Fusarium spp.
have been reported.
1214
However, this cross-reactivity
of Fusarium spp. in the GM assay is controversial.
15,16
We describe the case of a 65-year-old man with
AML who was under POS prophylaxis during his
remissioninduction chemotherapy. He developed a
disseminated fusariosis with GM antigenemia caused
by a plant pathogen belonging to the Fusarium fujiku-
roi species complex (FFSC). Although disseminated
infections caused by members of the FFSCespecially
F. proliferatum and F. verticillioidesare not unheard,
17
here, we present the first proven case
10
caused by
Fusarium andiyazi.
Case presentation
A 65-year-old male patient with AML-M2 was hospita-
lised with the diagnosis of community-acquired pneu-
monia. The patient received remissioninduction
chemotherapy, anti-biotherapy (piperacillin-tazobac-
tam; 3 94.5 g day
1
i.v. and clarithromycin;
29500 mg day
1
i.v.) for pneumonia and prophylac-
tic POS (3 9200 mg day
1
oral suspension) treatment
simultaneously. A computerised tomograph (CT) of his
thorax showed non-specific infection and calcificated
thickening (asbestos exposure) in both pleura (Fig. 1).
On the fourth day of treatment, because of persis-
tent fever and Stenotrophomonas maltophila growth in
his sputum culture, his anti-biotherapy was rear-
ranged (cefoperazone sulbactam; 2 92 g day
1
i.v.
and trimethoprim-sulphamethoxazole; 3 92 pharma-
ceutical vial day
1
i.v.). Although S. maltophila growth
was found in his BAL samples, there was no fungal
growth. No growth was obtained from his stool, urine,
or blood cultures. During the 26 days remission
induction therapy, no positive GM values in his twice
weekly blood samples were observed. Refractory leu-
kaemia was considered because of blastic infiltration
in his control peripheral smear, and a second round of
chemotherapy was begun. Steroid therapy was given
because of presumably allergic petechial and ecchy-
motic lesions.
On the 12th day of second chemotherapy, the
patient ran a fever again and CT showed new ground-
glass areas and cavitations in some consolidation areas
(Fig. 2). Two consecutive blood GM antigen tests came
back positive (indices values: 2.98 on the 12th day of
chemotherapy and 3.6 on the 16th day of chemother-
apy), and he was started on a classic amphotericin B
(AMB) (1 mg kg
1
day
1
i.v.) treatment. Because the
patient rejected a second bronchoscopy, it was not
performed. He developed side effects of classic AMB, so
his therapy was switched to liposomal AMB
(3 mg kg
1
day
1
i.v.). However, his clinical condi-
tion deteriorated, and the patient died on the 20th day
of second chemotherapy. At the time of deterioration,
in two blood samples, fungal growth morphologically
Figure 1 Non-specific infection and calcificated thickening of
pleura (asbestos exposure).
Figure 2 New infiltration areas and cavitations in some
consolidations.
©2013 Blackwell Verlag GmbH2
N. Kebabcı et al.
similar to Fusarium species was observed. The isolate
was then sent to the CBS-KNAW Fungal Biodiversity
Centre for further characterisation and identified as
FFSC-member F. andiyazi.
Macroscopic and microscopic morphological
study
The clinical isolate has been deposited in the reference
collection of CBS-KNAW, Utrecht, Netherlands, under
accession number CBS 134430. The strain was cul-
tured on malt extract agar (MEA), oatmeal agar (OA),
synthetic nutrient agar, Dichloran 18% glycerol agar,
and carnation leaf agar.
18,19
Culture plates were incu-
bated at 25 °C. Strain CBS 134430 grew fast on OA
and formed a white-to-lilac colony (Fig. 3A obverse;
3B reverse). The microconidia proved one-celled
(Fig. 3H), but rather than being formed in chainswere
mostly in false heads (Fig. 3E). These microconidia
were formed on branching conidiophores of average
length (Fig. 3D and G). The macroconidia were long
and thin (Macroconidia from the aerial hyphae sur-
rounded by some microconidia are shown in Fig. 3F),
and can be formed in sporodochia (Fig. 3C). In this
isolate after 2 weeks pseudochlamydospores were seen
as thickening cells within the mycelium that lacked
the darker colouration of a cell wall (Fig. 3I).
DNA isolation and sequencing:
DNA was extracted from the fungus grown on MEA
after an incubation period of 57 days in the dark at
25 °C by using the MoBio-UltraClean
TM
Microbial DNA
Isolation Kit (MO BIO Laboratories, Inc., Carlsbad, CA,
USA). Multilocus sequence typing (MLST) was per-
formed based on the internal transcribed spacer region
(ITS), and partial transcription elongation factor 1
alpha (TEF1a). Fragments of rpb2 sequences were not
informative as no reference data are available and
these data are not shown. Fragments containing the
ITS region were amplified using the universal primers
LS266 (GCATTC CCAAACAACTCGACTC) and V9G
(TTACGTCCCTGCCC TTTGTA).
20
For the partial
sequence of TEF1a, primers EF1 (ATGGGTAAGGARG-
ACAAGAC) and EF2 (GG ARGTACCAGTSATCATGTT)
were used.
21
The PCR fragments were sequenced with the ABI
Prism
â
Big DyeTM Terminator v. 3.0 ready reaction
cycle sequencing kit (Applied Biosystems, Foster City,
CA, USA). Samples were analysed on an ABI PRISM
3700 Genetic Analyzer (Applied Biosystems), and con-
tigs were assembled using the forward and reverse
sequences by using the SeqMan program from the
Lasergene software program (DNASTAR, Madison, WI,
USA). The sequences were compared via BLAST to
sequences in GenBank (http://www.ncbi.nlm.nih.gov/
genbank/), the Fusarium-ID database (http://isolate.
fusariumdb.org/), the Fusarium MLST database (http://
www.cbs. knaw.nl/fusarium/), and the internal CBS
database.
2224
Sequences of F. andiyazi strain CBS
134430 have been deposited in the GenBank database
with accession numbers KC954400 (ITS) and
KC954401 (TEF1a).
Phylogenetic analysis
Sequences of species of the FFSC, with Fusarium solani
species complex (FSSC) as an out-group, were col-
lected from GenBank and the CBS database. Where
possible, we used ITS and TEF1asequences from the
same isolate for both analyses. For the phylogenetic
analyses shown in this article, we used 23 aligned EF
sequences with a total length of 660 nucleotides and
14 aligned ITS sequences with a total length of 463
nucleotides.
Bayesian phylogenetic analyses were performed
using MrBayes 3.2.
25
The Metropolis-coupled Markov
chain Monte Carlo sampling approach was used to cal-
culate posterior probabilities. Four simultaneous Mar-
kov chains, three heated and one cold, were run
under a mixed model of sequence evolution and
gamma approximation for rate variation among sites.
Chains were analysed with random starting trees for
10
7
generations, sampling from trees every 1000th
generation. The burn-in period was set at 25%.
The ITS sequence of strain CBS 134430 indicates
that the species falls within the FFSC, but it does not
give a clear identification as to what species it belongs
to (Fig. 4). The analyses of the EF sequences confirm
the morphological finding that it actually is a F. andiy-
azi strain (Fig. 5)
Antifungal susceptibility testing
In vitro antifungal susceptibility testing was performed
for AMB (Bristol-Myers-Squib, Woerden, Netherlands),
FLU (Pfizer Central Research Sandwich, Tadworth,
Surrey, UK), ITR (Janssen Research Foundation,
Beerse, Belgium), voriconazole (VOR; Pfizer Central
Research Sandwich), POS (Schering-Plough, Kenil-
worth, NJ), isavuconazole (ISA; Basilea Pharmaceuti-
cals, Basel, Switzerland), caspofungin (CAS; Merck
Sharp & Dohme BV, Haarlem, the Netherlands) and
micafungin (MICA; Astellas, Tohoku, Japan). All
©2013 Blackwell Verlag GmbH 3
Fatal infection with Fusarium andiyazi
antifungal compounds were obtained from their man-
ufacturers as pure powders, and broth microdilution
was performed as described by the CLSI, in accordance
with the guidelines in document M38-A2.
26
Minimal
inhibitory concentrations (MICs) were the following:
AMB (8 lg ml), FLU (16 lg/ml
1
), ITR (8 lgml
1
),
(a) (b) (c)
(d) (e) (f)
(g) (h) (i)
Figure 3 Macroscopic and microscopic morphological study of Fusarium andiyazi strain CBS 134430. A. 10-day-old culture on Oatmeal
Agar (OA) (Obverse); B. same (Reverse); C. Sporodochia on carnation leaf agar; D. Branched conidiophore on OA; E. microconidia in
false heads in situ on OA; F. macroconidia from the aerial hyphae on OA; G. branched conidiophore on OAG; H. clavate to ovoid 0-sep-
tate microconidia on OA; I. pseudochlamydospores.
©2013 Blackwell Verlag GmbH4
N. Kebabcı et al.
VOR (2 lgml
1
), POS (1 lgml
1
), ISA (4 lgml
1
),
Minimum effective concentrations (MECs) were the fol-
lowing: CAS (8 lgml
1
) and MICA (>8lgml
1
).
Discussion
Although there are more than 100 Fusarium species,
the species of the FSSC (~50%) and the Fusarium oxy-
sporum species complex (~20%) are the most common
ones that cause infections in humans.
17
Disseminated
infections caused by members of the FFSC are not
unheard, and in this case, the cause is FFSC-member
F. andiyazi. It was described as new species from sor-
ghum in 2001
27
and this case reports the first isola-
tion from humans. Morphological characteristics are
often similar for Fusarium species. For this particular
species, the formation of pseudochlamydospores may
distinguish it from the other members of the FFSC.
However, this characteristic was relatively rare and
late in development, making it unsuitable for rapid
diagnostics. Based on MLST, the aetiological agent
was proven to be F. andiyazi. The sequencing of the
Figure 4 A Bayesian phylogenetic tree of
the internal transcribed spacer (ITS)
region illustrates that ITS sequences are
not useful for identification of members
of the Fusarium fujikuroi species complex.
Fusarium solani strains was used as out-
group. The numbers at the nodes are
Bayesian posterior probabilities. The scale
bar represents the number of estimated
changes per position for a unit of branch
length.
Figure 5 This Bayesian phylogenetic tree of a partial sequence of transcripion elongation factor 1-alpha shows that the different species
of the Fusarium fujikuroi species complex can all be recognised to species level. Fusarium solani strains was used as outgroup. The Fusari-
um andiyazi strain CBS 134430 that caused the fatal disseminated infection described in this report falls in a well-supported clade with
the environmental F. andiyazi strains. Numbers at the nodes are Bayesian posterior probabilities. The scale bar represents the number
of estimated changes per position for a unit of branch length.
©2013 Blackwell Verlag GmbH 5
Fatal infection with Fusarium andiyazi
ITS region did not resolve the closely related members
of the FFSC, but additional data on the partial TEF1a
sequence did. Although, sequencing ITS region is ideal
for most fungi, this is not the case for the members of
the genus Fusarium, for which it would be better to
rely on multiple sequences in a MLST for identifica-
tion.
21
F. andiyazi is a relatively new species that was
first found in sorghum in the US and Africa and has
since been identified on several other food crops
around the world.
2729
A serum GM antigen test specific for Aspergillus may
cross-react with some other fungi species. Blastomyces
dermatitidis,Nigrospora oryzae,Paecilomyces lilacinus,
Penicillium chrysogenum and Trichothecium roseum are
among them.
16
It has been reported that also some
Fusarium species have a GM antigen, and indeed, in
some cases, the test became positive.
13,14,16
In our case,
it is also shown that the new human aetiological agent,
F. andiyazi, causes GM antigen test positivity. Although,
approximately 85% of Fusarium-infected patients
develop skin lesions, often as one of the earliest manifes-
tations, there were no skin lesions on our patient, and
GM positivity was the first clue to the diagnosis.
Although decreasing in numbers, Candida and Asper-
gillus species are the most common types of fungal
infections seen in patients with haematological malig-
nant diseases. In patients under prophylactic treat-
ment, breakthrough infections caused by rarely seen
species are important.
30
Although the breakpoints of
antifungal agents have not been established for most
moulds, the MICs/MECs of our Fusarium strain were
high for most of the antifungals used in this study.
The MIC for POS was 1 lgml
1
and it appears that
the strain is most susceptible to this drug. Considering
that almost all fungal pathogens isolated during POS
prophylaxis were susceptible in vitro to the triazole,
the possibility of reduced absorption in our patient
must be considered. Many factors, such as the devel-
opment of mucositis, impaired dietary intake and the
use of proton pump inhibitors may cause pharmacoki-
netic variability in AML patients, and therapeutic drug
monitoring may be required.
31,32
There are several described breakthrough fungal
cases that developed during VOR prophylaxis and
treatment.
33,34
POS is a next-generation oral azole
with in vitro activity against a wide spectrum of medi-
cally important fungi. A breakthrough case of Alterna-
ria alternata in a patient with Fanconi’s anaemia who
received antifungal prophylaxis with POS was
described recently. However, in that patient finally a
combined treatment with liposomal AMB and again
POS seemed to result in a synergistic positive
interaction.
35
We present this case to attract attention
to the potential of POS breakthrough infections and to
a new human opportunistic Fusarium pathogen that
can cause GM positivity.
Acknowledgments
None of the authors has a potential conflict of interest.
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Fatal infection with Fusarium andiyazi
... are becoming more recognized as opportunistic pathogens in neutropenic patients (3). The most common species is F. Solani , but recently other Fusarium spp ., such as F. oxysporum , F. verticilloides, F. petroliphilum, F. napiforme F. andiyazi and F. proliferatum have emerged as a cause of invasive fusariosis in patients with hematological malignancies (8)(9)(10). ...
... Unfortunately, disseminated Fusariosis remains a difficult to treat infection with an almost 100% mortality rate in all reported cases of disseminated Fusariosis in patients with leukemia (5,8,9,11,12). The survival rate of patients with Fusariosis who are persistently neutropenic remains around 4 % in spite of aggressive therapy (13). ...
... Despite being well known as plant pathogens, Fusarium species (order Hypocraeles) cause a broad spectrum of superficial infections, such as keratitis and onychomycosis, as well as locally invasive and disseminated fusarioses in human and animals [1,2]. The genus Fusarium also contains species which may spoil crops by the production of persistent mycotoxins that affectconsumers' health [1]. ...
... 6 Invasive fusariosis has previously been reported as isolated case reports in patients receiving antifungal prophylaxis. [11][12][13][14][15][16] However, the impact of prophylactic strategies on the incidence and characteristics of invasive fusariosis has not been specifically addressed in case series. [17][18][19][20] Multicenter studies overcome the limitation of a low number of cases, although they are constrained by the lack of a denominator for patients at risk and by the heterogeneity of antifungal prophylaxis between centers and periods. ...
Article
Mould-active prophylaxis is affecting the epidemiology of invasive mycoses in the form of a shift toward less common entities such as fusariosis. We analyze the characteristics of invasive fusariosis and its association to antifungal prophylaxis in a retrospective cohort (2004-2017) from a tertiary hospital in Madrid, Spain. Epidemiological, clinical, microbiological, and antifungal consumption data were retrieved. Isolates were identified to molecular level, and antifungal susceptibility was tested. Eight cases of invasive fusariosis were diagnosed. Three periods were identified according to incidence: <2008 (three cases), 2008-2013 (zero cases), >2014 (five cases). All except one case involved breakthrough fusariosis. During the earliest period, the episodes occurred while the patient was taking itraconazole (two) or fluconazole (one); more recently, while on micafungin (three) or posaconazole (one). Early cases involved acute leukemia at induction/consolidation, recent cases relapsed/refractory disease (P = .029). Main risk factor for fusariosis (62.5%) was prolonged neutropenia (median 44 days). Galactomannan and beta-D-glucan were positive in 37.5% and 100% of cases, respectively. All isolates except F. proliferatum presented high minimal inhibitory concentrations (MICs) against the azoles and lower MIC to amphotericin B. Most patients received combined therapy. Mortality at 42 days was 62.5%. Resolution of neutropenia was associated with survival (P = .048). Invasive fusariosis occurs as breakthrough infection in patients with hematologic malignancy, prolonged neutropenia, and positive fungal biomarkers. Recent cases were diagnosed in a period of predominant micafungin use in patients who had more advanced disease and protracted neutropenia and for whom mortality was extremely high. Resolution of neutropenia was a favorable prognostic factor.
... Endogenous sources include pre-existing localised infections (sinusitis/onychomycosis/cellulitis/ interdigital intertrigo/abscess) spreading systemically due to Fusarium angio-invasion during prolonged or even short [80] periods of neutropenia. [3,62,63,[81][82][83][84] Disseminated fusariosis is commonly observed in patients with haematologic malignancies and HSCTs, [27,[85][86][87][88][89][90][91] including autologous transplants, [80] and rarely even in HIV-patients [92] and solid organ transplant recipients including liver, [93] lung [94,95] and kidney. [96] Their true incidence may very well be underestimated and invasive fusariosis needs to be ruled out in all cases of febrile neutropenia. ...
Article
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Fusarium is an emerging human opportunistic pathogen of growing importance, especially among immunosuppressed haematology patients due to an increased incidence of disseminated infections over the past two decades. This trend is expected only to continue due to the advances in medical and surgical technologies that will prolong the lives of the severely ill, making these patients susceptible to rare opportunistic infections. Production of mycotoxins, enzymes such as proteases, angio-invasive property and an intrinsically resistant nature, makes this genus very difficult to treat. Fusarium is frequently isolated from the cornea and less commonly from nail, skin, blood, tissue, Continuous Ambulatory Peritoneal Dialysis (CAPD) fluid, urine and pleural fluid. Conventional microscopy establishes the genus, but accurate speciation requires multilocus sequence typing with housekeeping genes such as internal transcribed spacer, translation elongation factor-1α and RPB1 and 2 (largest and second largest subunits of RNA polymerase), for which expansive internet databases exist. Identifying pathogenic species is of epidemiological significance, and the treatment includes immune reconstitution by granulocyte-colony-stimulating factor, granulocyte macrophage-colony-stimulating factor and a combination of the most active species - specific antifungals, typically liposomal amphotericin-B and voriconazole. However, patient outcome is difficult to predict even with in vitro susceptibility with these drugs. Therefore, prevention methods and antifungal prophylaxis have to be taken seriously for these vulnerable patients by vigilant healthcare workers. The current available literature on PubMed and Google Scholar using search terms 'Fusarium', 'opportunistic invasive fungi' and 'invasive fusariosis' was summarised for this review.
... Fusarium thapsinum has been previously reported as a human pathogen causing keratitis and onychomycosis [11,14]. A fatal breakthrough infection with F. andiyazi in a patient with acute leukemia was reported in 2014 [47]. Fusarium pseudocircinatum has been recently reported as a plant pathogen [48]. ...
Article
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Availability of molecular methods, gene sequencing, and phylogenetic species recognition have led to rare fungi being recognized as opportunistic pathogens. Fungal keratitis and onychomycosis are fairly common mycoses in the tropics, especially among outdoor workers and enthusiasts. The frequently isolated etiological agents belong to genera Candida, Aspergillus, and Fusarium. Within the genus Fusarium, known to be recalcitrant to prolonged antifungal treatment and associated with poor outcome, members of the Fusarium solani species complex are reported to be most common, followed by members of the Fusarium oxysporum SC and the Fusarium fujikuroi SC (FFSC). Morphological differentiation among the various members is ineffective most times. In the present study, we describe different species of the FFSC isolated from clinical specimen in south India. All twelve isolates were characterized up to species level by nucleic acid sequencing and phylogenetic analysis. The molecular targets chosen were partial regions of the internal transcribed spacer rDNA region, the panfungal marker and translation elongation factor-1α gene, the marker of choice for Fusarium speciation. Phylogenetic analysis was executed using the Molecular Evolutionary Genetics Analysis software (MEGA7). In vitro susceptibility testing against amphotericin B, voriconazole, posaconazole, natamycin, and caspofungin diacetate was performed following the CLSI M38-A2 guidelines for broth microdilution method. The twelve isolates of the FFSC were F. verticillioides (n = 4), F. sacchari (n = 3), F. proliferatum (n = 2), F. thapsinum (n = 1), F. andiyazi (n = 1), and F. pseudocircinatum (n = 1). To the best of our knowledge, this is the first report of F. andiyazi from India and of F. pseudocircinatum as a human pathogen worldwide. Natamycin and voriconazole were found to be most active agents followed by amphotericin B. Elderly outdoor workers figured more among the patients and must be recommended protective eye wear.
... Despite being well known as plant pathogens, Fusarium species (order Hypocraeles) cause a broad spectrum of superficial infections, such as keratitis and onychomycosis, as well as locally invasive and disseminated fusarioses in human and animals [1,2]. The genus Fusarium also contains species which may spoil crops by the production of persistent mycotoxins that affectconsumers' health [1]. ...
Article
Full-text available
Clinically relevant members of the fungal genus, Fusarium, exhibit an extraordinary genetic diversity and cause a wide spectrum of infections in both healthy individuals and immunocompromised patients. Generally, Fusarium species are intrinsically resistant to all systemic antifungals. We investigated whether the presence or absence of the ability to produce biofilms across and within Fusarium species complexes is linked to higher resistance against antifungals. A collection of 41 Fusarium strains, obtained from 38 patients with superficial and systemic infections, and three infected crops, were tested, including 25 species within the Fusarium fujikuroi species complex, 14 from the Fusarium solani species complex (FSSC), one Fusarium dimerum species complex, and one Fusarium oxysporum species complex isolate. Of all isolates tested, only seven strains from two species of FSSC, five F. petroliphilum and two F. keratoplasticum strains, recovered from blood, nail scrapings, and nasal biopsy samples, could produce biofilms under the tested conditions. In the liquid culture tested, sessile biofilm-forming Fusarium strains exhibited elevated minimum inhibitory concentrations (MICs) for amphotericin B, voriconazole, and posaconazole, compared to their planktonic counterparts, indicating that the ability to form biofilm may significantly increase resistance. Collectively, this suggests that once a surface adherent biofilm has been established, therapies designed to kill planktonic cells of Fusarium are ineffective.
... (i) Intrinsic resistance: the innate ability of a Fusarium species to resist activity of an antifungal agent through its inherent structural or functional characteristics without prior exposure to the drug, which allows tolerance of a drug or antifungal class. It occurs naturally in Fusarium species that have never been susceptible to that agent [25,35,36]. (ii) Acquired resistance: used to describe the resistance that arises in Fusarium after exposure to the antifungal agent. ...
Article
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The resistance among various opportunistic Fusarium species to different antifungal agents has emerged as a cause of public health problems worldwide. Considering the significance of multi-drug resistant (MDR), this paper emphasizes the problems associated with MDR and the need to understand its clinical significance to combat microbial infections. The search platform PubMed/MEDLINE and a review of 32 cases revealed a common multidrug-resistant profile exists, and clinically relevant members of Fusarium are intrinsically resistant to most currently used antifungals. Dissemination occurs in patients with prolonged neutropenia, immune deficiency, and especially hematological malignancies. Amphotericin B displayed the lowest minimum inhibitory concentrarions (MICs) followed by voriconazole, and posaconazole. Itraconazole and fluconazole showed high MIC values, displaying in vitro resistance. Echinocandins showed the highest MIC values. Seven out of ten (70%) patients with neutropenia died, including those with fungemia that progressed to skin lesions. Clinical Fusarium isolates displayed a common MDR profile and high MIC values for the most available antifungal agents with species- and strain-specific differences in antifungal susceptibility. Species identification of Fusarium infections is important. While the use of natamycin resulted in a favorable outcome in keratitis, AmB and VRC are the most used agents for the treatment of fusariosis in clinical settings.
Article
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An increase is observed in the frequency and diversity of fungal infections in the world and in our country. Improving the quality of patient care in infections due to rare moulds depends on early diagnosis and appropriate treatment. Raising awareness about these infections will facilitate taking the necessary steps for diagnosis and treatment in similar cases. In addition to 165 cases out of 96 studies included in this review article, 28 studies reporting rare mould isolation with limited case information were examined. The number of studies reporting cases that meet the criteria has increased over the years. The most frequently reported mould was Fusarium spp. (n= 74), followed by Scedosporium/Pseudallescheria spp. (n= 20). In 25 of the cases, dematiaceous fungi were isolated. Eye (n= 44), skin/soft tissue (n= 35), disseminated (n= 34) peritoneum (n= 13), respiratory tract (n= 13), sinus (n= 12), central nervous system (n= 10), nail (n= 3) and urinary system (n= 1) involvement was detected in the cases. Two cases due to Scedosporium apiospermum and Fonsecaea pedrosoi started locally but spread over time. Among eye involvements, two outbreak reports in which Fusarium spp. was the causative agent drew attention. Of the patients with disseminated involvement, only two who developed Exophiala dermatitidis infection did not have any conditions affecting the immune system. In all peritoneal infections, the patient had a peritoneal catheter (12 for continuous ambulatory peritoneal dialysis and one for drainage). In seven out of 10 cases with central nervous system involvement, dematiaceous fungi were isolated. Appropriate diagnosis and treatment of cases due to rare mould infections can be improved by providing knowledge on the subject in the world and in our country. In these infections where treatment success is limited, correct identification of the causative agent and application of appropriate treatment provides an advantage for clinical success. In this review article, publications from Turkey in Pubmed, Scopus and TR Directory records were searched based on The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) rules and the situation of rare mould infections in our country have been discussed.
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Fungal eye infections can lead to loss of vision and blindness. The disease is most prevalent in the tropics, although case numbers in moderate climates are increasing as well. This study aimed to determine the dominating filamentous fungi causing eye infections in Germany and their antifungal susceptibility profiles in order to improve treatment, including cases with unidentified pathogenic fungi. As such, we studied all filamentous fungi isolated from the eye or associated materials that were sent to the NRZMyk between 2014 and 2020. All strains were molecularly identified and antifungal susceptibility testing according to the EUCAST protocol was performed for common species. In total, 242 strains of 66 species were received. Fusarium was the dominating genus, followed by Aspergillus, Purpureocillium, Alternaria, and Scedosporium. The most prevalent species in eye samples were Fusarium petroliphilum, F. keratoplasticum, and F. solani of the Fusarium solani species complex. The spectrum of species comprises less susceptible taxa for amphotericin B, natamycin, and azoles, including voriconazole. Natamycin is effective for most species but not for Aspergillus flavus or Purpureocillium spp. Some strains of F. solani show MICs higher than 16 mg/L. Our data underline the importance of species identification for correct treatment.
Thesis
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During the last decades, human infections by Fusarium species (Fungi) have shown global increase, both in immunocompromised and in immunocompetent patients. These infections can be classified in four classes: (1) superficial infections of skin and nails, (2) keratitis of the cornea, and (3) deep localized and (4) disseminated infections. In this PhD project we addressed some of the major problems connected to human fusarioses. (1) We first identified and delimited the species that are etiological agents of different types of infections. Our molecular and phylogenetic studies were performed by using multi-gene analysis of BT, TEF1, TOPO1, PGK, RPB2 and ITS. The results confirmed that Fusarium is monophyletic. (2) Subsequently we aimed to understand which properties are essential in virulence of these opportunists, given the fact that the great majority of their saprobic and plant-pathogenic relatives are not known to be involved in human disease. (3) Furthermore, we developed diagnostic tools for the clinical laboratory. Knowing that current culture-dependent characterization methods for deep infections are often too slow, we introduced faster DNA-based or whole cell-based identification techniques such as MALDI-TOF MS to characterize these species. MALDI-TOF MS approach can be performed with minimal amounts of sample and takes only 15−30 minutes and are cheap. AFLP fingerprinting has successfully been applied in this study with a large numbers of clinical and environmental strains. Our findings indicate that AFLP analysis and MLSA analysis provide high resolution data allowing discrimination between Fusarium species and genotypes. (4) Finally, once etiological agents have been properly recognized and identified, we tested susceptibility profiles of most of opportunistic Fusarium against a panel of anitifungal compounds. In vitro antifungal testing showed that amphotericin B and voriconazole were the antimycotics with the best overall in vitro activity, followed by posaconazole. In vitro combination activity of natamycin alone and in combination with voriconazole was judged optimal for Fusarium keratitis and showed 70% synergism.
Article
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ITS sequencing data indicate a low degree of variability of Cladophialophora bantiana. The species is restricted to strains differing in less than 6 ITS1 positions. Supplementary SSU and ITS RFLP data show that 31 strains can be assigned to this species. The great majority of these originate from brain infections of humans, cats and dogs. All possess a 558 bp intron at position 1768 in the SSU rDNA gene; a primer selective for the intron and hence diagnostic for the species has been developed. One cerebral strain proves to be a hitherto undescribed species. Subcutaneous strains cluster in Xylohypha emmonsii at about 35 bp difference from C. bantiana; this taxon is re-introduced despite high nDNA homology values. Cladophialophora devriesii contains a single strain; C. arxii is a somewhat heterogeneous assemblage.
Book
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The ultimate benchtool for diagnostics. All currently 660 fungi proven infectious agents are full described, many with beautiful photo-plates in full color and with informative line-drawings. Ample information is provided on pathogenicity, biosafety levels and antifungal susceptibility, supported by over 7000 references. Chapters on diseases, diagnostic methods and therapy are added. With more than 3000 citations in the literature, the Atlas is unchallenged as an aid in hospital diagnostics
Article
Despite increasing reports of life-threatening Fusarium infections, little is known about its pathogenesis and management. To evaluate the epidemiology, clinicopathologic features, and outcome of invasive fusariosis in patients with hematologic cancer, we conducted a retrospective study of invasive fusarial infections in patients with hematologic malignancy treated at a referral cancer center over a 10-year period (1986 to 1995), as well as a literature review. Forty patients with disseminated and three patients with invasive lung infection were included in the analysis. All patients were immunocompromised. The infection occurred in three patients postengraftment following bone marrow transplantation. All patients were diagnosed antemortem. Thirteen patients responded to therapy, but the infection relapsed in two of them. Response was associated with granulocyte transfusions, amphotericin B lipid formulations (four patients each), and an investigational triazole (two patients). Resolution of infection was only seen in patients who ultimately recovered from myelosuppression. Portal of entry was the skin (33%), the sinopulmonary tree (30%), and unknown (37%). Fusarium causes serious morbidity and mortality, and may mimic aspergillosis. The infection seems to respond to newer therapeutic approaches, but only in patients with ultimate recovery from myelosuppression, and it may relapse if neutropenia recurs.
Article
We describe a new Fusarium species in section Liseola from sorghum in Africa and the United States. This species is distinguished morphologically by the production of unique pseudochlamydospores in carnation leaf pieces on carnation leaf agar, and appears to be most closely related to F. thapsinum. The new species also can be distinguished molecularly by means of Amplified Fragment Length Polymorphisms, AFLPs. Strains with both MAT-1 and MAT-2 mating types were identified, but no sexual stage was generated in crosses made under laboratory conditions.
Chapter
Studies on the early development of root-parasitic weeds comprise the most difficult to monitor stages in the life- cycle of these plants. In order to monitor this host-parasite interaction different growing systems were developed which support the growth of both the host plant and the parasite at least for a certain time and which allow regular monitoring.
Chapter
Topics not Covered, or Receiving Secondary Emphasis Biosafety Considerations: Before You Begin Work with Pathogenic Fungi… Fungi Defined: Their Ecologic Niche Medical Mycology A Brief History of Medical Mycology Rationale for Fungal Identification Sporulation Dimorphism Sex in Fungi Classification of Mycoses Based on the Primary Site of Pathology Taxonomy/Classification: Kingdom Fungi General Composition of the Fungal Cell Primary Pathogens Endemic Versus Worldwide Presence Opportunistic Fungal Pathogens Determinants of Pathogenicity General References in Medical Mycology Selected References for Introduction to Fundamental Medical Mycology Websites Cited Questions
Article
For the first time in over 20 years, a comprehensive collection of photographs and descriptions of species in the fungal genus Fusarium is available. This laboratory manual provides an overview of the biology of Fusarium and the techniques involved in the isolation, identification and characterization of individual species and the populations in which they occur. It is the first time that genetic, morphological and molecular approaches have been incorporated into a volume devoted to Fusarium identification. The authors include descriptions of species, both new and old, and provide protocols for genetic, morphological and molecular identification techniques. The Fusarium Laboratory Manual also includes some of the evolutionary biology and population genetics thinking that has begun to inform the understanding of agriculturally important fungal pathogens. In addition to practical how-to protocols it also provides guidance in formulating questions and obtaining answers about this very important group of fungi. The need for as many different techniques as possible to be used in the identification and characterization process has never been greater. These approaches have applications to fungi other than those in the genus Fusarium. This volume presents an introduction to the genus Fusarium, the toxins these fungi produce and the diseases they can cause. The Fusarium Laboratory Manual is a milestone in the study of the genus Fusarium and will help bridge the gap between morphological and phylogenetic taxonomy. It will be used by everybody dealing with Fusarium in the Third Millenium. -W.F.O. Marasas, Medical Research Council, South Africa.
Article
We describe a new Fusarium species in section Liseola from sorghum in Africa and the United States. This species is distinguished morphologically by the production of unique pseudochlamydospores in carnation leaf pieces on carnation leaf agar, and appears to be most closely related to F. thapsinum. The new species also can be distinguished molecularly by means of Amplified Fragment Length Polymorphisms, AFLPs. Strains with both MAT-1 and MAT-2 mating types were identified, but no sexual stage was generated in crosses made under laboratory conditions.
Article
Alternaria spp. have emerged as opportunistic pathogens particularly in immunosuppressed patients, such as bone marrow transplant recipients. The authors present a case of Alternaria alternata in a patient with Fanconi’s anemia, who received antifungal prophylaxis with posaconazole after an unrelated bone marrow transplantation, followed by empirical antifungal treatment with caspofungin when persistent fever emerged until cutaneous lesions eventually appeared. At that time there were clinical reasons to assume that the patient had an infection with an emerging fungus. This consideration triggered a change of the antifungal therapy from caspofungin to liposomal amphotericin B. After collecting sufficient evidence for the presence of an invasive fungal infection by A. alternata and given the severity of neutropenia and other immunosuppression, oral posaconazole was added to liposomal amphotericin B. The course of disease in this case suggests a possibly synergistic interaction between liposomal amphotericin B and posaconazole when administered simultaneously to treat an invasive systemic infection by Alternaria spp. in immunocompromised patients.