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- The term "South American blastomycosis" is sometimes used to describe an infection with Paracoccidioides brasiliensis, though the term Paracoccidioidomycosis is more frequently used to describe this condition.
Skin lesions of blastomycosis.
|Classification and external resources|
Blastomycosis (also known as "North American blastomycosis", "Blastomycetic dermatitis", and "Gilchrist's disease") is a fungal infection of humans and other animals, notably dogs and occasionally cats, caused by the organism Blastomyces dermatitidis. Endemic to portions of North America, blastomycosis causes clinical symptoms similar to histoplasmosis. The disease occurs in several endemic areas the most important of which is in eastern North America, particularly in the western and northern periphery of the Great Lakes Basin, extending eastward along the south shore of the St. Lawrence River Valley and southward in the territory spanned by the central Appalachian Mountains in the east, to the Mississippi River Valley in the west. Sporadic cases have been reported in continental Africa, the Arabian Peninsula and the Indian subcontinent.
- 1 History
- 2 Causative agent
- 3 Spectrum of disease
- 4 Pathogenesis
- 5 Signs and symptoms
- 6 Diagnosis
- 7 Treatment
- 8 Prognosis
- 9 Epidemiology
- 9.1 Urban infections
- 9.2 Seasonal trends
- 9.3 Gender bias
- 9.4 Ethnic populations
- 9.5 Communicability
- 10 Additional images
- 11 See also
- 12 References
- 13 External links
Blastomycosis was first described by Thomas Casper Gilchrist in 1894 and sometimes goes by the eponym Gilchrist's disease. It is also sometimes referred to as Chicago Disease.
Blastomycosis is caused by the dimorphic microfungus Blastomyces dermatitidis, a member of the phylum Ascomycota in the family Ajellomycetaceae. It has been recognised as the asexual state of Ajellomyces dermatitidis. In endemic areas, the fungus lives in soil and rotten wood near lakes and rivers. Although it has never been directly observed growing in nature, it is thought to grow there as a cottony white mold, similar to the growth seen in artificial culture at 25 °C. The moist, acidic soil in the surrounding woodland harbors the fungus.
Spectrum of disease
Blastomycosis manifests as a primary lung infection in about 70% of cases. The onset is relatively slow and symptoms are suggestive of pneumonia, often leading to initial treatment with antibacterials. Occasionally, if a lesion is seen on X-ray in a cigarette smoker, the disease may be misdiagnosed as carcinoma, leading to swift excision of the pulmonary lobe involved. Upper lung lobes are involved somewhat more frequently than lower lobes. If untreated, many cases progress over a period of months to years to become disseminated blastomycosis. In these cases, the large Blastomyces yeast cells translocate from the lungs and are trapped in capillary beds elsewhere in the body, where they cause lesions. The skin is the most common organ affected, being the site of lesions in approximately 60% of cases. The signature image of blastomycosis in textbooks is the indolent, verrucous or ulcerated dermal lesion seen in disseminated disease. Osteomyelitis is also common (12–60% of cases). Other recurring sites of dissemination are the genitourinary tract (kidney, prostate, epididymis; collectively ca. 25% of cases) and the brain (3–10% of cases).
An uncommon but very dangerous type of primary blastomycosis manifests as acute respiratory distress syndrome (ARDS); for example, this was seen in 9 of 72 blastomycosis cases studied in northeast Tennessee. Such cases may follow massive exposure, e.g., during brush clearing operations. The fatality rate in the ARDS cases in the Tennessee study was 89%, while in non-ARDS cases of pulmonary blastomycosis, the fatality rate was 10%.
Blastomycosis also affects an indefinitely broad range of mammalian hosts, and dogs in particular are a highly vulnerable sentinel species. They generally suffer a disease that begins with acute respiratory symptoms and rapidly progresses to death. Cats are the animals next most frequently detected as infected.
Inhaled conidia of B. dermatitidis are phagocytosed by neutrophils and macrophages in alveoli. Some of these escape phagocytosis and transform into yeast phase rapidly. Having thick walls, these are resistant to phagocytosis and express glycoprotein, BAD-1, which is a virulence factor as well as an epitope. In lung tissue, they multiply and may disseminate through blood and lymphatics to other organs, including the skin, bone, genitourinary tract, and brain. The incubation period is 30 to 100 days, although infection can be asymptomatic.
Signs and symptoms
Blastomycosis can present in one of the following ways:
- a flu-like illness with fever, chills, arthralgia (joint pain), myalgia (muscle pain), headache, and a nonproductive cough which resolves within days.
- an acute illness resembling bacterial pneumonia, with symptoms of high fever, chills, a productive cough, and pleuritic chest pain.
- a chronic illness that mimics tuberculosis or lung cancer, with symptoms of low-grade fever, a productive cough, night sweats, and weight loss.
- a fast, progressive, and severe disease that manifests as ARDS, with fever, shortness of breath, tachypnea, hypoxemia, and diffuse pulmonary infiltrates.
- skin lesions, usually asymptomatic, can be verrucous (wart-like) or ulcerated with small pustules at the margins.
- bone lytic lesions can cause bone or joint pain.
- prostatitis may be asymptomatic or may cause pain on urinating.
- laryngeal involvement causes hoarseness.
- 40% immunocompromised individuals have CNS involvement and present as brain abscess, epidural abscess or meningitis.
Once suspected, the diagnosis of blastomycosis can usually be confirmed by demonstration of the characteristic broad based budding organisms in sputum or tissues by KOH prep, cytology, or histology. Tissue biopsy of skin or other organs may be required in order to diagnose extra-pulmonary disease. Blastomycosis is histologically associated with granulomatous nodules. Commercially available urine antigen testing appears to be quite sensitive in suggesting the diagnosis in cases where the organism is not readily detected. While culture of the organism remains the definitive diagnostic standard, its slow growing nature can lead to delays in treatment of up to several weeks. However, sometimes blood and sputum cultures may not detect blastomycosis.
Itraconazole given orally is the treatment of choice for most forms of the disease. Ketoconazole may also be used. Cure rates are high, and the treatment over a period of months is usually well tolerated. Amphotericin B is considerably more toxic, and is usually reserved for immunocompromised patients who are critically ill and those with central nervous system disease. Patients who cannot tolerate deoxycholate formulation of Amphotericin B can be given lipid formulations. Fluconazole has excellent CNS penetration and is useful where there is CNS involvement after initial treatment with Amphotericin B.
Mortality rate in treated cases
- 0-2% in treated cases among immunocompetent patients
- 29% in immunocompromised patients
- 40% in the subgroup of patients with AIDS
- 68% in patients presenting as acute respiratory distress syndrome (ARDS)
Incidences in most endemic areas are circa 0.5 per 100,000 population, with occasional local areas attaining as high as 12 per 100,000. Most Canadian data fit this picture. In Ontario, Canada, considering both endemic and non-endemic areas, the overall incidence is around 0.3 cases per 100,000; northern Ontario, mostly endemic, has 2.44 per 100,000. Manitoba is calculated at 0.62 cases per 100,000. Remarkably higher incidences were shown for the Kenora, Ontario region: 117 per 100,000 overall, with aboriginal reserve communities experiencing 404.9 per 100,000. In the United States, the incidence of blastomycosis is similarly high in hyperendemic areas. For example, the city of Eagle River, Vilas County, Wisconsin, which has an incidence rate of 101.3 per 100,000; the county as a whole has been shown in two successive studies to have an incidence of ca. 40 cases per 100,000. An incidence of 277 per 100,000 was roughly calculated based on 9 cases seen in a Wisconsin aboriginal reservation during a time in which extensive excavation was done for new housing construction. The new case rates are greater in northern states such as Wisconsin, where from 1986 to 1995 there were 1.4 cases per 100,000 people.
The study of outbreaks as well as trends in individual cases of blastomycosis has clarified a number of important matters. Some of these relate to the ongoing effort to understand the source of infectious inoculum of this species, while others relate to which groups of people are especially likely to become infected. Human blastomycosis is primarily associated with forested areas and open watersheds; It primarily affects otherwise healthy, vigorous people, mostly middle-aged, who acquire the disease while working or undertaking recreational activities in sites conventionally considered clean, healthy and in many cases beautiful. Repeatedly associated activities include hunting, especially raccoon hunting, where accompanying dogs also tend to be affected, as well as working with wood or plant material in forested or riparian areas, involvement in forestry in highly endemic areas, excavation, fishing and possibly gardening and trapping.
There is also a developing profile of urban and other domestic blastomycosis cases, beginning with an outbreak tentatively attributed to construction dust in Westmont, Illinois. The city of Rockford, Illinois, was also documented as a hyperendemic area based on incidence rates as high as 6.67 per 100,000 population for some areas of the city. Though proximity to open watersheds was linked to incidence in some areas, suggesting that outdoor activity within the city may be connected to many cases, there is also an increasing body of evidence that even the interiors of buildings may be risk areas. An early case concerned a prisoner who was confined to prison during the whole of his likely blastomycotic incubation period. An epidemiological survey found that although many patients who contracted blastomycosis had engaged in fishing, hunting, gardening, outdoor work and excavation, the most strongly linked association in patients was living or visiting near waterways. Based on a similar finding in a Louisiana study, it has been suggested that place of residence might be the most important single factor in blastomycosis epidemiology in north central Wisconsin. Follow-up epidemiological and case studies indicated that clusters of cases were often associated with particular domiciles, often spread out over a period of years, and that there were uncommon but regularly occurring cases in which pets kept mostly or entirely indoors, in particular cats, contracted blastomycosis. The occurrence of blastomycosis, then, is an issue strongly linked to housing and domestic circumstances.
Seasonality and weather also appear to be linked to contraction of blastomycosis. Many studies have suggested an association between blastomycosis contraction and cool to moderately warm, moist periods of the spring and autumn or, in relatively warm winter areas. However, the entire summer or a known summer exposure date is included in the association in some studies. Occasional studies fail to detect a seasonal link. In terms of weather, both unusually dry weather and unusually moist weather have been cited. The seemingly contradictory data can most likely be reconciled by proposing that B. dermatitidis prospers in its natural habitats in times of moisture and moderate warmth, but that inoculum formed during these periods remains alive for some time and can be released into the air by subsequent dust formation under dry conditions. Indeed, dust per se or construction potentially linked to dust has been associated with several outbreaks The data, then, tend to link blastomycosis to all weather, climate and atmospheric conditions except freezing weather, periods of snow cover, and extended periods of hot, dry summer weather in which soil is not agitated.
Sex is another factor inconstantly linked to contraction of blastomycosis: though many studies show more men than women affected, some show no sex-related bias. As mentioned above, most cases are in middle aged adults, but all age groups are affected, and cases in children are not uncommon.
Ethnic group or race is frequently investigated in epidemiological studies of blastomycosis, but is potentially profoundly conflicted by differences in residence and in quality and accessibility of medical care, factors that have not been stringently controlled for to date. In the USA, a disproportionately high incidence and/or mortality rate is occasionally shown for blacks; whereas aboriginals in Canada are disproportionately linked to blastomycosis in some studies but not others. Incidence in aboriginal children may be unusually high. The Canadian data in some areas may be confounded or explained by the tendency to establish aboriginal communities in wooded, riparian, northern areas corresponding to the core habitat of B. dermatitidis, often with known B. dermatitidis habitats such as woodpiles and beaver constructions in the near vicinity.
There are a very small number of cases of human-to-human transmission of B. dermatitidis related to dermal contact or sexual transmission of disseminated blastomycosis of the genital tract among spouses.
Budding yeasts in cytoplasm of giant cells at arrows. Broad-based budding and double countoured cell wall seen in the giant cell in the center is characteristic of Blastomyces dermatiditis.
Granuloma with early suppuration. Fungal organisms difficult to recognize at this low magnification.
Large yeast-like fungi seen within giant cells at arrows.
Nodular skin lesions of blastomycosis, one of which is a bullous lesion on top of a nodule.
- South American blastomycosis
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- Blastomycosis information and message board
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- Blastomycosis From Wikipedia, the free encyclopedia Jump to: navigation, search The term "South American blastomycosis" is sometimes used to describe an infection with Paracoccidioides brasiliensis,  though the term Paracoccidioidomycosis ...
- Blastomycosis. Blastomycosis is a fungal infection caused by inhalation of aerosolized conidia (spores) of Blastomyces dermatitidis. ... Blastomycosis is a fungal infection caused by inhalation of aerosolized conidia ...
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- ブラストミセス症 blastomycosis
- Blastomyces dematitidis
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- カンジダ症 candidiasis
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- Rhizopus oryae
代表的な真菌症 CBT QB vol2 p.193
|原因菌||皮膚糸状菌||Sporothrix schenckii||Candida albicans||Malassezia furfur|
- first aid step1 2006 p.146
|coccidioidomycosis||Southwestern United States, California.|
|histoplasmosis||Mississippi and Ohio river valleys.|
|paracoccidioidomycosis||Rural Latin America.|
|blastomycosis||States east of Mississippi River and Central America.|