Fusarium are filamentous non-pigmented septated fungi ubiquitous in the environment. Fusariosis is a not uncommon invasive mold infection in patients with hematologic malignancies and hematopoietic cell transplants.
Fusarium species are filamentous fungi commonly found in the environment, particularly in soil, on plants, and in water systems and can cause a spectrum of diseases in humans ranging from superficial, invasive, and disseminated infections via inhalation, ingestion, or direct inoculation.
In the system of fungi the genus Fusarium is classified in the class Hyphomycetes which belongs to the Deuteromycotina. Teleomorphs have been placed in the genera Nectria and Gibberella, order Hypocreales (Ascomycetes).
In general, control of Fusarium wilt disease can be accomplished by improving soil conditions, planting disease-resistant varieties, removing infected plant tissues, using clean seeds, and using soil and fungicides.
Fusarium oxysporum (Schlecht as emended by Snyder and Hansen), an ascomycete fungus, comprises all the species, varieties and forms recognized by Wollenweber and Reinking within an infrageneric grouping called section Elegans. It is part of the family Nectriaceae.
Fusarium are filamentous non-pigmented septated fungi ubiquitous in the environment. Fusariosis is a not uncommon invasive mold infection in patients with hematologic malignancies and hematopoietic cell transplants.
Fusarium species produce three important classes of mycotoxins, namely trichothecenes, fumonisins, and zearalenones with their mycoestrogens. These toxins are highly toxic and carcinogenic to farm and laboratory animals and have been associated with human esophageal cancer and birth defects [14,15].
Natamycin is active against Fusarium species both in vitro and in vivo, and is used along with voriconazole as the mainstay of treatment for Fusarium keratitis. Onychomycosis is treated with terbinafine, voriconazole and sometimes itraconazole.
Rubino warns that “exposure to Fusarium may result in skin infections, sore throat, runny nose, sneezing, itchy eyes, and dermatitis.” Additionally, “prolonged exposure can lead to severe conditions such as bone infections or brain abscesses,” he continues.
There is no effective fungicide or other cure for Fusarium wilt. The pathogen nearly always kills infected hosts. Prevention and exclusion are the only effective management strategies. Avoid this problem by replanting at that site using species from different genera than plants previously infected there by Fusarium.
Fusarium venenatum is produced industrially for use as a human food by Marlow Foods, Ltd., and is marketed under the name Quorn in Europe and North America. Fusarium strain flavolapis is also produced as a human food by Nature's Fynd under the name Fy in North America.
Fusarium species cause a wide spectrum of infections in humans, ranging from superficial and locally invasive to disseminated, with the most prevalent infections being onychomycosis, skin infections, and keratitis 15.
Fusarium is a common mold that can be found just about everywhere. It is often found on soil and plants, both indoors and out. It can grow on many types of food, and on many surfaces, particularly those that have suffered water damage. Fusarium can grow and spread at lower temperatures.
In immunocompromised patients, inhalation or inoculation due to a minor trauma can lead to disseminated Fusarium infection. Fusarium species, in particular, Fusarium solani, are common causes of keratitis. They are also common causes of onychomycosis, endophthalmitis, and skin and musculoskeletal infections.
Fusarium has typically been treated with fungicides containing chemicals such as Prochloraz, Iprodione or Propiconazole.
Most notably, Aspergillus shows dichotomous branching (a single hypha branches into 2 even hyphae) whereas Fusarium branches randomly. In tissue sections, this difference may be extremely difficult to identify, and Fusarium and Aspergillus are often indistinguishable.
Fusarium species are important plant pathogens causing various diseases such as crown rot, head blight, and scab on cereal grains (72), and they may occasionally cause infection in animals (32).
Fusarium mycotoxins can cross the intestinal epithelium and reach the systemic compartment [20,24], affecting the immune system. Exposure to these toxins can either result in immunostimulatory or immunosuppressive effects depending on the age of the host and exposure dose and duration [20,25].
Colonies are usually fast growing, pale or bright-coloured (depending on the species) with or without a cottony aerial mycelium. The colour of the thallus varies from whitish to yellow, pink, red or purple shades. Species of Fusarium typically produce both macro- and microconidia from slender phialides.
Fusarium species are highly prevalent in patients with onychomycosis. Amphotericin B has shown excellent in vitro activity against different Fusarium species. Except for voriconazole, Fusarium species have shown broad resistance to azoles including fluconazole and itraconazole.
One of the most useful biological methods to reduce aflatoxins is the application of probiotic yeasts and bacteria in the diet. Although dairy diets may be associated with dangerous microorganisms,9 they are considered as the main source of several types of probiotics.
Saxitoxins are also known as paralytic shellfish poisons (PSPs). Most human saxitoxin toxicoses have been associated with the ingestion of marine shellfish, which accumulate saxitoxins produced by marine dinoflagellates.