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    <ArticleType>Review Article</ArticleType>
    <TitleGroup>
      <Title language="en">Fusarium spp.: infections and intoxications</Title>
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        <PersonNames>
          <Lastname>Hof</Lastname>
          <LastnameHeading>Hof</LastnameHeading>
          <Firstname>Herbert</Firstname>
          <Initials>H</Initials>
          <AcademicTitle>Prof. Dr. med.</AcademicTitle>
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        <Address>MVZ Labor Limbach u. Kollegen, Im Breitpiel 16, 69126 Heidelberg, Germany, Phone: &#43;49 621 17890210<Affiliation>Labor Limbach and colleagues, Heidelberg, Germany</Affiliation></Address>
        <Email>herbert.hof&#64;labor-limbach.de</Email>
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          <Lastname>Schrecker</Lastname>
          <LastnameHeading>Schrecker</LastnameHeading>
          <Firstname>Jens</Firstname>
          <Initials>J</Initials>
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        <Address>
          <Affiliation>Department of Ophthalmology, Rudolf Virchow Klinikum Glauchau, Germany</Affiliation>
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        <Email>jens.schrecker&#64;t-online.de</Email>
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          <Corporatename>German Medical Science GMS Publishing House</Corporatename>
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        <Address>D&#252;sseldorf</Address>
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    <SubjectGroup>
      <SubjectheadingDDB>610</SubjectheadingDDB>
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    <DatePublished>20240927</DatePublished></DatePublishedList>
    <Language>engl</Language>
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      <AltText language="en">This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License.</AltText>
      <AltText language="de">Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung).</AltText>
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      <Journal>
        <ISSN>2195-8831</ISSN>
        <Volume>12</Volume>
        <JournalTitle>GMS Infectious Diseases</JournalTitle>
        <JournalTitleAbbr>GMS Infect Dis</JournalTitleAbbr>
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    <ArticleNo>04</ArticleNo>
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    <Abstract language="en" linked="yes"><Pgraph>The genus <Mark2>Fusarium</Mark2>, member of the <Mark2>Hypocreaceae</Mark2> family, comprises over 500 spp. with an ever-evolving taxonomy. These fungi, some highly pathogenic, primarily affect various plants, including major crops like maize, rice, cereals, and potatoes, leading to significant agricultural losses and contributing to human undernutrition in certain regions. Additionally, <Mark2>Fusarium</Mark2> spp. produce harmful mycotoxins like trichothecenes, fumonisins, zearalenones, etc., posing health risks to animals and humans. These toxins generally transferred to food items can cause diverse issues, including organ failure, cancer, and hormonal disturbances, with effects sometimes appearing years after exposure. The fungi&#8217;s vast genetic repertoire enables them to produce a range of virulence factors, leading to infections in both animals and humans, particularly in immunocompromised individuals. <Mark2>Fusarium</Mark2> spp. can cause systemic infections and local infections like keratitis. Due to limited antifungal effectiveness and biofilm formation, these infections are often challenging to treat with poor outcomes.</Pgraph></Abstract>
    <TextBlock linked="yes" name="Introduction">
      <MainHeadline>Introduction</MainHeadline><Pgraph><Mark2>Fusarium</Mark2> spp. belong to a heterogeneous group of ascomycetous hyalohyphomycetes. This genus comprises a large number of &#62;500 recognized phylogenetic species. Hence, the identification and classification of single strains is challenging and in laboratory routine occasionally frustrating. Molecular methods have been applied in modern times to identify and characterize the various <Mark2>Fusarium</Mark2> spp., since the descriptions of micromorphological characters have turned out to be imprecise. Several genes, for example the TEF1&#945; gene, or whole DNA regions, respectively, have been employed to characterize the species boundaries within the genus <Mark2>Fusarium</Mark2> <TextLink reference="1"></TextLink>. One has to admit, however, that the precise identification is tricky, since the genomic analysis has clustered in species which are morphological quasi identical (cryptic species). The delineation of certain species is indeed sometimes delicate, so that in practice one has created so-called complexes of several strains more or less related to each other. For example, the <Mark2>F. fujikuroi</Mark2> complex (teleomorph: <Mark2>Giberrella</Mark2> <Mark2>fujikuroi</Mark2> complex) consists of about 50 species whereby <Mark2>F. fujikuroi</Mark2> (<Mark2>sensu stricto</Mark2>), <TextGroup><Mark2>F. p</Mark2></TextGroup><Mark2>roliferatum</Mark2> and <Mark2>F. verticillioides</Mark2> are the most important ones <TextLink reference="2"></TextLink>, <TextLink reference="3"></TextLink>, <TextLink reference="4"></TextLink>. The <Mark2>F. solani</Mark2> complex (<Mark2>Nectria solani</Mark2> complex) is composed of &#62;40 different species <TextLink reference="5"></TextLink>. The <Mark2>F. graminearum</Mark2> complex (<Mark2>Gibberella graminearum</Mark2> complex) yields at least 15 species <TextLink reference="1"></TextLink>, which differ in their geographic distribution as well as their host preferences. One has to keep in mind that it is hard to recognize in publications whether the reported propertie<TextGroup><PlainText>s refer to s</PlainText></TextGroup>ingle strains or to entire complexes. <Mark2>Fusarium</Mark2> spp. ranged among several distinct teleomorph genera su<TextGroup><PlainText>ch a</PlainText></TextGroup>s <Mark2>Neocosmospora</Mark2> <TextLink reference="6"></TextLink>, <Mark2>Albonectria</Mark2>, <Mark2>Cyanonectria</Mark2>, <Mark2>Gibberella</Mark2>, <Mark2>Haematonectria</Mark2> and <Mark2>Nectria</Mark2>. The most relevant species are listed in Table 1 <ImgLink imgNo="1" imgType="table"/>.</Pgraph><Pgraph>The taxonomy of this fungal group is still controversially discussed among experts; there is still a fundamental debate going on <TextLink reference="6"></TextLink>. In addition it is confusing that in the literature a fungus will appear under various names <TextLink reference="7"></TextLink>; for example <Mark2>F. fujikuroi</Mark2> was named <Mark2>F. moniliforme</Mark2> form<TextGroup><PlainText>erl</PlainText></TextGroup>y. </Pgraph><Pgraph>MALDI-TOF turned out to be a reliable method in laboratory routine for differentiation of isolates for practic<TextGroup><PlainText>al p</PlainText></TextGroup>urposes <TextLink reference="2"></TextLink>, <TextLink reference="8"></TextLink>.</Pgraph><Pgraph><Mark2>Fusarium</Mark2> spp. are characterized by well-developed, septated, non-pigmented hyphae with acute-angled bifurcations forming typical macroconidia, so-called sporodochial conid<TextGroup><PlainText>ia varying in shape, size, and number from one s</PlainText></TextGroup>pecies to another. The microconidia are so-called aleuriospores, which do not originate from specialized conidiophores but directly from the hyphae. These small, hydrophobic spores are easily distributed by air. Sexual reproduction is rarely observed under routine laboratory conditions <TextLink reference="7"></TextLink>.</Pgraph><Pgraph><Mark2>Fusarium</Mark2> spp. are cosmopolitan hyphomycetes growing ubiquitously especially in soil, water and on plants, namely on roots as well as on leaves <TextLink reference="7"></TextLink>. Because of their versatile biologic properties, they play a notable role in nature <TextLink reference="9"></TextLink>. Indeed, the majority of <Mark2>Fusarium</Mark2> spp., in particular <Mark2>F. verticillioides</Mark2> and <Mark2>F. graminearum</Mark2>, are primarily plant pathogens effectuating worldwide immense crop losses. This destruction of plants entails an important medical relevance, namely these fungi are the main reasons for hunger and undernutrition representing major medical problems. Virtually all <Mark2>Fusarium</Mark2> spp. are capable to produce a more or less wide range of mycotoxins causing severe medical consequences. Unfortunately, these aspects are definitely ignored and&#47;or underestimated by medical doctors <TextLink reference="7"></TextLink>. In practice, tests for mycotoxin levels of human specimen are requested rarely, which indicates that during the medical clarification of unclear symptoms intoxications by mycotoxins are not suspected in most instances. In humans, at least certain <Mark2>Fusarium</Mark2> spp. can cause a variety of infections, which are highly dependent upon the portal of entry and the immune status of the host <TextLink reference="10"></TextLink>.</Pgraph></TextBlock>
    <TextBlock linked="yes" name="Plant pathogens">
      <MainHeadline>Plant pathogens</MainHeadline><Pgraph>Because of their comprehensive genetic repertoire, <Mark2>Fusarium</Mark2> spp. are rather versatile <TextLink reference="9"></TextLink> and can settle and thrive under variable conditions, i.e. on different plants <TextLink reference="11"></TextLink>, whereby some fungi attack particularl<TextGroup><PlainText>y roots wh</PlainText></TextGroup>ereas others prefer leaves. Anyway, certain species have developed host preferences, so that these fungi are found predominantly on specific plants (Table 1 <ImgLink imgNo="1" imgType="table"/>), although they may occasionally also affect other hosts, too. Furthermore, there are geographical and climatic distinctions in their local dominance <TextLink reference="1"></TextLink>. They may grow saprophytically, i.e. they may degrade dead, organic material<TextGroup><PlainText>s, but som</PlainText></TextGroup>etimes they may behave parasitically, which means that they attack and damage parts of living plants. Fungi are equipped with a large genome and, therefore, possess a broad array of genes, which can be involved in plant infections. Fungi are real chemical factories in producing enzymes. Virulent strains, for their parts, produce large amounts of secretory proteins and cell-wall-degrading enzymes, which are able to damage the host und to induce diseases <TextLink reference="12"></TextLink>. Biofilm formation seems to play a crucial role in the <Mark2>Fusarium</Mark2> induced plant diseases <TextLink reference="11"></TextLink>. In addition, mycotoxins are accused to play a role in plant disease development, since some are phytotoxic <TextLink reference="13"></TextLink>. Conversely, mycotoxins may function as fungal virulence factors in plant infections promoting the expansion in a host <TextLink reference="14"></TextLink> (Table 2 <ImgLink imgNo="2" imgType="table"/>).</Pgraph><Pgraph>In agriculture <Mark2>Fusarium</Mark2> spp. play an immense role, since some fungi may produce devastating pests in the fields. One of the most relevant pests are induced by <TextGroup><Mark2>F. g</Mark2></TextGroup><Mark2>ram</Mark2><TextGroup><Mark2>i</Mark2></TextGroup><Mark2>n</Mark2><TextGroup><Mark2>earu</Mark2></TextGroup><Mark2>m</Mark2> in wheat, barley, oats, rye and triticale, inducing so-called Fusarium head blind (sometimes called Fusarium ear blind); also other <Mark2>Fusarium</Mark2> spp., such as <Mark2>F. tricinctum</Mark2>, are accused to trigger such plant diseases. <TextGroup><Mark2>F. v</Mark2></TextGroup><Mark2>erticillioides</Mark2> is infesting especially maize <TextLink reference="7"></TextLink>. <TextGroup><Mark2>F. fu</Mark2></TextGroup><Mark2>jikuroi</Mark2>, on the other hand, is responsible for maize ear rot, soybean root rot, and in particular for bakanae in rice <TextLink reference="3"></TextLink>. <TextGroup><Mark2>F. o</Mark2></TextGroup><Mark2>xysporum</Mark2> may cause banana wilt (<TextGroup><PlainText>also known</PlainText></TextGroup> as Panama disease) <TextLink reference="11"></TextLink>. Furthermore, <TextGroup><Mark2>F. o</Mark2></TextGroup><Mark2>xysporum</Mark2> causes wilt diseases in many popular garden and greenhouse flowers and are most serious and common in aster, chrysanthemum, gladiolus, lily, and narcissus. In mimosa wilt the fungus <Mark2>F. oxysporum</Mark2> enters through the roots and spreads into the relatively large xylem vessels. The interruption of the water flow to the leaves will result in wilt disease. Because of their ability to produce large numbers of infective conidia, the fungi are able to spread rapidly by air even over long distances. This propagation will be particularly detrimental in monocultures, where pests often infest vast areas.</Pgraph><Pgraph>Hence, <Mark2>Fusarium</Mark2> spp. destroy considerable amounts of crop yields annually, causing a huge loss, and lead to a massive reduction of the economic income in the producer countries on various continents of the world <TextLink reference="3"></TextLink>.</Pgraph><Pgraph>Therapy often fails, which will be due either to resistance of <Mark2>Fusarium</Mark2> spp. to the agents used (i.e. in most cases azoles) <TextLink reference="15"></TextLink> or to the fact that they form biofilms <TextLink reference="11"></TextLink>. Hence, the prevention of the propagation of fungal conidia is of crucial importance. Therefore, it is a frequent practice to utilize large quantities of synthetic fungicides, i.e. pesticides, for prophylaxis. Large amounts of different azole derivatives are applied in agriculture to minimize the risks of fungal infections of food crops and of toxin production, accepting the risk of emergence of resistant strains arising inevitably after persistent administration <TextLink reference="16"></TextLink>, <TextLink reference="17"></TextLink>. Recently, eco-friendly strategies, suc<TextGroup><PlainText>h as b</PlainText></TextGroup>iocontrol, have become applicable more and more <TextLink reference="17"></TextLink>.</Pgraph><Pgraph>Quite another aspect is the property of some <Mark2>Fusarium</Mark2> spp., such as <Mark2>F. fujikuroi</Mark2> <TextLink reference="12"></TextLink>, to produce gibberellin, which exerts stimulatory effects on the growth of some plants.</Pgraph></TextBlock>
    <TextBlock linked="yes" name="Mycotoxins">
      <MainHeadline>Mycotoxins</MainHeadline><Pgraph>By definition mycotoxins are products of the secondary metabolic pathways during late logarithmic growth of moulds <TextLink reference="18"></TextLink>, <TextLink reference="19"></TextLink>. In fact, more than 400 different mycotoxins and their metabolites are described. This heterogeneous group of toxic substances <TextLink reference="18"></TextLink>, <TextLink reference="19"></TextLink> play a role in phytopathology as well as in animal and human pathophysiology <TextLink reference="13"></TextLink>. Whereas a few mycotoxins are stored in the fungal conidia and thereupon are distributed by air, the vast majority of mycotoxins, including the <Mark2>Fusarium</Mark2> mycotoxins, are sectored into the surroundings and hence contaminate a variety of foodstuffs. Foodstuffs recognized as the most risky for <Mark2>Fusarium</Mark2> mycotoxins are maize <TextLink reference="13"></TextLink>, grains, rice, beans, coffee, wine, fruits, nuts, spices, eggs, and meat products after carryover. The problem is that their occurrence is not fully preventable in spite of research efforts and mitigation strategies. Consequently, preharvest contamination of both foods and feeds with <Mark2>Fusarium</Mark2> mycotoxin is an almost inevitable phenomenon worldwide <TextLink reference="14"></TextLink>, <TextLink reference="17"></TextLink>, <TextLink reference="20"></TextLink>, <TextLink reference="21"></TextLink>. </Pgraph><Pgraph>The most important <Mark2>Fusarium</Mark2> mycotoxins are the trichothecenes (including deoxynivalenol (also known as vomitoxin), nivalenol and T-2 toxin besides zearalenones and fumonisins (Table 3 <ImgLink imgNo="3" imgType="table"/>). All these agents are ingested by food; the consequences for humans are not really known and are largely underestimated <TextLink reference="2"></TextLink>, <TextLink reference="17"></TextLink>, <TextLink reference="20"></TextLink>, <TextLink reference="21"></TextLink>.</Pgraph><Pgraph>Among the so-called &#8220;emerging <Mark2>Fusarium</Mark2> mycotoxins&#8221; moniliformin, enniatins and beauvericin should be mentioned. Their true role is not yet well established and understood <TextLink reference="17"></TextLink>, <TextLink reference="21"></TextLink>.</Pgraph><Pgraph>The numbers of various toxins and the amounts produced are determined by the genetic equipment of the fungal strains. In addition, environmental conditions can be crucial. In a special situation, it is hard to predict the extent of the problem. <Mark2>Fusarium</Mark2> mycotoxins occur frequently in many foods but fortunately at low concentrations, so there is a need to provide sensitive and reliable methods for their detection. But they can be accumulated in the tissues of cereals and vegetables in high, i.e. harmful, concentrations. In general, maize and rice can be contaminated in high concentrations <TextLink reference="3"></TextLink>. Many toxins like fumonisins and trichothecenes are heat-stable and cannot be deactivated by cooking. The different mycotoxins exert their toxic effects in living creatures by quiet diverse metabolic processes <TextLink reference="22"></TextLink>. Acute intoxications are often described in animals fed with highly contaminated feeds but are rather rare in humans &#8211; at least in developed countries &#8211; but may occur after exposure to excessive doses, especially in situations like war and natural catastrophes. By far the most illnesses are related to chronic or repeated exposure. Since the toxic consequences will manifest a long time after the exposure, the individual will not remember the risk at the time when the health problems are noticed. Hence, it is difficult to recognize that there is a causal link between the former mycotoxin intake and the actual disease symptoms. Obviously, in these disease entities the mycotoxins are a pathogenicity factor but not virulence factors, which means that the producing strain will not profit from its performance <TextLink reference="23"></TextLink>.</Pgraph><Pgraph>One has to keep in mind that co-contamination with mycotoxins from other molds may also occur in food items and their synergistic activities can augment the health injuries.</Pgraph><Pgraph>The only way to surpass the threat posed by <Mark2>Fusarium</Mark2> mycotoxins is to prevent or inhibit the production of mycotoxins in the field <TextLink reference="17"></TextLink>. Laboratory survey of mycotoxin pollution of food items is of concern to note risky items that should be eliminated from the food chain <TextLink reference="21"></TextLink>.</Pgraph></TextBlock>
    <TextBlock linked="yes" name="Animal infections">
      <MainHeadline>Animal infections</MainHeadline><Pgraph>For example, in aquatic animals such as seahorses and dolphins <Mark2>Fusarium</Mark2> spp. are able to cause opportunistic infections. The clinical manifestations include local infections such as keratitis or local skin invasion but also organ infections of lungs, liver, cartilage and so on <TextLink reference="24"></TextLink>. In sea turtles, for example, they may attack the eggs when they hatch secured by sand under states of high stickine<TextGroup><PlainText>ss an</PlainText></TextGroup>d a warm and consistent temperature. They distur<TextGroup><PlainText>b the e</PlainText></TextGroup>mbryo development which finally is responsib<TextGroup><PlainText>le for the d</PlainText></TextGroup>ramatic egg mortality leading to a decline of turtle population worldwide <TextLink reference="24"></TextLink>.</Pgraph><Pgraph>In dogs, horses and cattle keratitis can be induced <TextGroup><PlainText>as well</PlainText></TextGroup> as invasive sinusitis <TextLink reference="24"></TextLink>.</Pgraph><Pgraph>By the way, the exposure of animals to high concentrations of mycotoxins may lead to leukoencephalomalacia, pulmonary edema or liver injury <TextLink reference="24"></TextLink>.</Pgraph></TextBlock>
    <TextBlock linked="yes" name="Human infections">
      <MainHeadline>Human infections</MainHeadline><Pgraph>From a medical perspective, <Mark2>Fusarium</Mark2> spp. are rather harmless environmental microbes rarely causing human infections <TextLink reference="25"></TextLink>, <TextLink reference="26"></TextLink>.</Pgraph><SubHeadline>Disseminated infections</SubHeadline><Pgraph>This entity represents a threatening situation, since the outcome of these infections occuring in already sick people is generally rather poor, not least due to the facts that exact diagnosis is often established late. The symptoms are in most cases not pathognomonic so that the suspicion of <Mark2>Fusarium</Mark2> infection by clinicia<TextGroup><PlainText>ns emerges d</PlainText></TextGroup>elayed, often only in case of refractory antibacterial and antifungal treatment. The awareness of <Mark2>Fusarium</Mark2> infections is still modest. Furthermore, the laboratory results including exact, reliable differentiation as well as susceptibility testing are available after tedious processes only. In addition, the susceptibility to antifu<TextGroup><PlainText>ngal agents is g</PlainText></TextGroup>enerally low. </Pgraph><Pgraph>In humans, <Mark2>Fusarium</Mark2> spp. cause a variety of infections, which are highly dependent upon the portal of entry and the immune status of the host. Invasion via colonized catheters is a common cause of such manifestations. In severely immunocompromised patients, for example due to leukemia, opportunistic <Mark2>Fusarium</Mark2> spp. are able to induce locally restricted cutaneous inflammations. There is, however, a tendency to disseminate usually associated with positive blood cultures. It should be emphasized that <Mark2>Fusarium</Mark2> spp. &#8211; in contrast to <Mark2>Aspergillus fumigatus</Mark2> &#8211; are principally capable of adventitious sporulation, which allows positive blood cultures and dissemination of conidia via the blood <TextLink reference="27"></TextLink>. Indeed, besides fungemia practically all organs may be affected; the most common manifestations are peritonitis in patients receiving dialysis, thrombophlebitis, arthritis, osteomyelitis, endophthalmitis, sinusitis and pneumonia <TextLink reference="10"></TextLink>. Even neurologic infections have been reported <TextLink reference="28"></TextLink>. The species that are most commonly involved in human infection are <Mark2>Fusarium solani</Mark2>, followed by <Mark2>Fusarium oxysporum</Mark2> and <Mark2>Fusarium verticillioides</Mark2> (out of the <Mark2>F. fujikuroi</Mark2> complex; Table 1 <ImgLink imgNo="1" imgType="table"/>) <TextLink reference="10"></TextLink>.</Pgraph><Pgraph>Nosocomial infections of immunocompromised patients have been reported, whereby water distribution systems (drains, faucet aerators, shower heads, sanitary installations) in hospitals are most likely to be the mechanism of aerial dispersal of the conidia responsible for the transmission to the host. Furthermore, airborne conidia may also represent a relevant source of infection <TextLink reference="24"></TextLink>.</Pgraph><SubHeadline>Local infections &#8211; on focus: keratitis</SubHeadline><Pgraph>In immunocompetent people, <Mark2>Fusarium</Mark2> spp. may cause superficial infections such as onychomycosis <TextLink reference="10"></TextLink>, <TextLink reference="24"></TextLink>, <TextLink reference="26"></TextLink>, whereby it should be critically assessed in each case whether the ubiquitous <Mark2>Fusarium</Mark2> spp. are really the etiologic agents of the disease or only contaminants. Most probably the ability of <Mark2>Fusarium</Mark2> spp. to trigger nail infections <TextLink reference="26"></TextLink> is overestimated. In principle, <Mark2>Fusarium</Mark2> spp. are able to form biofilms on the surface of nails, hampering eradication <TextLink reference="24"></TextLink>. </Pgraph><Pgraph>Keratitis due to <Mark2>Fusarium</Mark2> spp. is a relevant entity. It is rather common in certain geographical areas such as India <TextLink reference="29"></TextLink>, which is due to a strong prevalence of fungal conidia in these areas leading to a higher exposition <TextLink reference="5"></TextLink> and to predisposing factors such as an enhanced susceptibility of people, possibly because of concomitant irritations of the eyes by other stimuli. The predisposing factors are numerous but often remain unclear in an individual case. The major risk factors are use of contact lenses and trauma or operative intervention damaging the cornea, or blocked tear ducts <TextLink reference="30"></TextLink>. In Germany, where several dozens of cases have been described over the last ten years, the majority of affected patients are otherwise healthy women of approximately 50 years of age <TextLink reference="31"></TextLink>.</Pgraph><Pgraph>Although fungal keratitis is often associated with trauma and prior application of corticosteroids <TextLink reference="32"></TextLink>, wearing of contact lenses, especially in combination with inadequate hygiene precautions and mold-growth permissive storage fluids, is an important risk factor for such an infection <TextLink reference="33"></TextLink>.</Pgraph><Pgraph>Despite meeting sterilization and antimicrobial standards by the lens manufacturer, poor hygiene practices and improper interactions with lenses and storage equipment can lead to contamination by <Mark2>Fusarium</Mark2> spp. Drying, dilution, or antimicrobial component absorption by the lenses along with the abilities of <Mark2>Fusarium</Mark2> spp. for rapid growth and penetration contribute to the risk. The omission of the manual cleaning step in the solution&#8217;s use was also identified as a significant risk factor for developing fungal keratitis <TextLink reference="34"></TextLink>. Lens care solutions within contact lens cases can become concentrated and form dried films due to evaporation or because the cases are topped off by the user instead of being emptied, cleaned, and refilled regularly <TextLink reference="35"></TextLink>. Zhang et al. <TextLink reference="5"></TextLink> showed that such films on plastic surfaces of lens cases can support the growth of selective isolates of fungus.</Pgraph><Pgraph>Storage fluids for contact lenses differ in relation to their fungicidal ability. Common products are based on disinfectant agents like Aldox 0.0006&#37; and polyquaternium 0.001&#37;, H<Subscript>2</Subscript>O<Subscript>2</Subscript> 3&#37; or PHMB 0.0001&#37;. Schrenker et al. <TextLink reference="36"></TextLink> concluded that the risk of <Mark2>Fusarium</Mark2> spp. contaminations may be enhanced by the usage of PHMB-based storage fluids in comparison to formulations based on 3&#37; hydrogen peroxide or Aldox. The effect of PHMB may be enhanced by the addition of pH-regulators, but the effect is variable and difficult to assess in real life use. Schrenker&#8217;s data showed that storage fluids containing either 3&#37; hydrogen peroxide or Aldox are highly effective against <Mark2>Fusarium</Mark2> spp. and prevent contaminatio<TextGroup><PlainText>n of c</PlainText></TextGroup>ontact lenses with fungal conidia <TextLink reference="36"></TextLink>.</Pgraph><Pgraph>Another possible factor for the increased incidence of <Mark2>Fusarium</Mark2> keratitis among contact lens wearers may be partly due to the formation of biofilms by fusaria on lenses, lens cases, corneal tissue, or a combination of these surfaces <TextLink reference="35"></TextLink>. Imamura <TextLink reference="35"></TextLink> developed a reproducible <Mark2>in vitro</Mark2> model of fungal biofilm formatio<TextGroup><PlainText>n on c</PlainText></TextGroup>ontact lenses and demonstrated that <Mark2>Fusarium</Mark2> and <Mark2>Candida</Mark2> can form biofilms on commonly used soft contact lenses and that the amount, metabolic activity, thickness, and architecture of these fungal biofilms is influenced by the surface properties of the lenses used <TextLink reference="35"></TextLink>. Ahearn et al. <TextLink reference="37"></TextLink> showed that <Mark2>Fusarium</Mark2> mats (in contrast to more tightly bounded candida biofilms) tended to be loosely associated with the lenses and could be released from the lens surface by vigorous shaking or rinsing of the lens. However, there are also findings that the attachment to the lens surface varies from a loose association of conidia and hyphae to firmly attached hyphae that are difficult or impossible to remove <TextLink reference="35"></TextLink>. The role of biofilm formation in fungal keratitis still needs to be further investigated.</Pgraph><Pgraph>Occasionally, outbreaks due to contaminated lens solutions are reported <TextLink reference="33"></TextLink>, <TextLink reference="38"></TextLink>.</Pgraph><Pgraph><Mark2>Fusarium</Mark2> spp. are equipped with a variety of virulence factors such as mannoproteins on their surface, enabling them to adhere to laminins, fibronectins and collagens on the cornea, where they are able propagate at the given temperature <TextLink reference="30"></TextLink>. Furthermore, <Mark2>Fusarium</Mark2> spp. are able to create a biofilms on the surface of a cornea &#8211; not only on plants <TextLink reference="11"></TextLink>. This protects them against defense mechanisms of the innate immunity. Because of their large genetic repertoire <Mark2>Fusarium</Mark2> spp. produce in large amounts an array of proteases, phospholipase and cytotoxic peptides, neutralizing antimicrobial oligopeptides, such as lysozyme and defensins, of the humoral, non-specific defences <TextLink reference="39"></TextLink>.</Pgraph><Pgraph>Often, a fungal keratitis does not remain limited to the cornea but rather breaks through the anatomical barrier, namely the Descemet&#8217;s membrane, (Figure 1 <ImgLink imgNo="1" imgType="figure"/>) by the help of their virulence factors allowing the pathogen to penetrate the inner eye and to cause endophthalmitis eventually <TextLink reference="30"></TextLink>, <TextLink reference="39"></TextLink>, <TextLink reference="40"></TextLink>. Such a fatal propagation may finally require an enucleation of the eye <TextLink reference="39"></TextLink>. </Pgraph><Pgraph>Various <Mark2>Fusarium</Mark2> spp. are able to cause keratitis but members of the <Mark2>Fusarium solani</Mark2> complex such <Mark2>F. petroliphilum</Mark2>, <Mark2>F. keratoplasticum</Mark2>, <Mark2>Fusarium tonkinense</Mark2> and <TextGroup><Mark2>F. s</Mark2></TextGroup><Mark2>olani</Mark2> (sensu stricto) are the prevailing agents <TextLink reference="31"></TextLink>.</Pgraph></TextBlock>
    <TextBlock linked="yes" name="Therapy">
      <MainHeadline>Therapy</MainHeadline><Pgraph>Antimicrobial testing of <Mark2>Fusarium</Mark2> spp. is not performed routinely, because the standard <Mark2>in vitro</Mark2> test methods are not broadly approved. EUCAST (European Committee on Antimicrobial Susceptibility Testing) and CLSI (Clinical and Laboratory Standards Institute) recommendations of performing <Mark2>in vitro</Mark2> susceptibility tests differ partially such as inoculum size, glucose composition, pH of the medium, incubation temperature and duration, which may influence the minimum inhibitory concentrations (MICs) values. Furthermore, the interpretation of laboratory results is problematic, since the correlation between <Mark2>in vitro</Mark2> susceptibility tests and clinical outcome is sometimes poor. Hence, antifungal susceptibility testing can predict the outcome of treatment only in main traits. Low MICs do not guarantee clinical success, while high MICs are associated with lower probability of a favorable response to a given antifungal agent. In spite of these inconsistencies, <Mark2>in vitro</Mark2> testing remains useful in guiding clinicians in taking the right therapeutic decision.</Pgraph><Pgraph>The therapeutic management of <Mark2>Fusarium</Mark2> infections, localized or disseminated, is usually challenging due to the site of infection, the underlying disease, and the intrinsic resistance to many antifungal agents currently available <TextLink reference="41"></TextLink>. Especially <Mark2>F. solani</Mark2> is rather resistant to typical antifungal agents such as azoles and often disposes elevated MICs of amphotericin B. The most effective antifungal in treating<Mark2> F. solani</Mark2> infections is amphotericin B, although even this agent has only modest success in the treatment of serious systemic infection <TextLink reference="24"></TextLink>, <TextLink reference="41"></TextLink>. Indeed, all <Mark2>Fusarium</Mark2> species are naturally resistant to echinocandins and flucytosine.</Pgraph><Pgraph>The prognosis of disseminated fusarioses is generally rather poor <TextLink reference="41"></TextLink> with survival rates at day 90 post diagnosis of 13&#37; to 21&#37;, depending on underlying conditions. <TextGroup><PlainText>Based on the results of clinical studies, the European S</PlainText></TextGroup>ociety for Microbiology and Infectious Diseases has recommended the use of voriconazole as first-line therapy for invasive <Mark2>Fusarium</Mark2> infections regardless of the causative species <TextLink reference="42"></TextLink>. Ruhnke et al. <TextLink reference="43"></TextLink> suggest the combination of liposomal amphotericin B and voriconazole in severely sick patients and posaconaole as an alternative and in addition surgical removal of infected sites. Newer azole derivatives such as posaconazole <TextLink reference="41"></TextLink>, <TextLink reference="44"></TextLink> and isavuconazole <TextLink reference="45"></TextLink> can be considered as an alternative for prophylaxis and salvage therapy, although even these agents may have no reliable activity, because some fungi have undergone mutations, which render azoles generally rather ineffective <TextLink reference="15"></TextLink>, <TextLink reference="24"></TextLink>.</Pgraph><Pgraph>According to the generally accepted Tarragona principles <TextLink reference="46"></TextLink> for antibiotic therapy of severe infectious diseases, the therapy should start as early as possible; this holds also true for <Mark2>Fusarium</Mark2> infections <TextLink reference="47"></TextLink>.</Pgraph><Pgraph>The therapy of keratitis is also challenging. Besides natamycin, which can be applied only topically, amphoterici<TextGroup><PlainText>n B</PlainText></TextGroup> is prefered for the first-line therapy <TextLink reference="39"></TextLink>. Natamycin in combination with voriconazole has also been recommended for fusarial keratitis <TextLink reference="48"></TextLink>. It could be expected that in the future other azole derivatives such as posaconazole <TextLink reference="44"></TextLink> and isavuconazole <TextLink reference="45"></TextLink> can be considered as alternatives, although comprehensive ophthalmologic experience with these new azoles is still lacking.</Pgraph><Pgraph>The therapeutic success of antifungals is not only dependent on the <Mark2>in vitro</Mark2> activity of agents <TextLink reference="31"></TextLink> but can be im<TextGroup><PlainText>p</PlainText></TextGroup>aired by the biofilm production by <Mark2>Fusarium</Mark2> spp. In case that antifungals (given topically or systematically) fail, surgical interventions, for example a keratoplasty (Fi<TextGroup><PlainText>gure 1</PlainText></TextGroup>B <ImgLink imgNo="1" imgType="figure"/>), are indicated <TextLink reference="39"></TextLink>.</Pgraph></TextBlock>
    <TextBlock linked="yes" name="Notes">
      <MainHeadline>Notes</MainHeadline><SubHeadline>Competing interests</SubHeadline><Pgraph>The authors declare that they have no competing interests.</Pgraph></TextBlock>
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          <Caption><Pgraph><Mark1>Table 1: List of some relevant </Mark1><Mark1><Mark2>Fusarium</Mark2></Mark1><Mark1> spp. and their major roles</Mark1></Pgraph></Caption>
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          <Caption><Pgraph><Mark1>Table 2: Virulence factors of phytopathogenic, parasitic </Mark1><Mark1><Mark2>Fusarium</Mark2></Mark1><Mark1> spp.</Mark1></Pgraph></Caption>
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          <Caption><Pgraph><Mark1>Table 3: The most relevant </Mark1><Mark1><Mark2>Fusarium</Mark2></Mark1><Mark1> mycotoxins for human health (according to &#91;21&#93;)</Mark1></Pgraph></Caption>
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          <Caption><Pgraph><Mark1>Figure 1: Keratitis in an immunocompetent patient by </Mark1><Mark1><Mark2>F. tonkinense</Mark2></Mark1><Mark1> (see &#91;39&#93;) </Mark1><LineBreak></LineBreak><Mark1>A: Left eye with a whitish corneal infiltrate upon hospital admission</Mark1><LineBreak></LineBreak><Mark1>B: The same eye, several weeks after large-diameter repeat keratoplasty: despite temporal stagnation under highly intensive local and systemic therapy, the infection spread within the anterior segment and finally into the vitreous.</Mark1></Pgraph></Caption>
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