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Blastomycosis

Clinical Presentation

Patient is a 36 year-old African American male from Baton Rouge, La. He was admitted into the ER suffering from shortness of breath and productive cough for two weeks. Ulcerative lesions are found on the patient’s left calf. Patient reports pain located at the knees. HIV test was positive. Chest x-rays and tissue biopsy were performed. The tissue biopsy of the ulcerative lesions showed fungal organism that suggest Blastomyces dermatidis. In addition, a sputum test was performed and found fungal organism present confirming Blastomyces dermatidis.

Patient began working on a construction site along the river about two months ago. Reports of patients suffering similar symptoms have been found in the past year in the same area that this patient worked at. Officials are testing the soil to determine if conidia of Blastomyces dermatidis are present. Patient was put on itraconazole for two weeks. Initial progress was slow but the fungal infection eventually cleared up. Lesions are beginning to heal and patient reports that he no longer have trouble breathing. His coughs are reduced as well. Long-term treatment with itraconazole is required in order to prevent a reoccurrence.

What is Blastomycosis?

Blastomycosis is a fungal infection caused by a fungus called Blastomyces dermatidis

It is found in moist soil, specifically in rotting vegetation

It is contracted through inhalation, and it starts by infecting the lungs

From the lungs it disseminates into the bloodstream and lymphatics where it spread to the rest of the body

Also involves the skin, joint, bones, organs, central nervous system

weakened immune systems, such as those with HIV or who have had an organ transplant

Uncommon but can deadly in adults

Clinical Manifestation

Chronic illness

low-grade fever

productive cough

fatigue

night sweats

weight loss

Respiratory Signs of Blastomycosis

Rapidly progressive, and severe disease, eg, multilobar pneumonia or ARDS

fever

shortness of breath

tachypnea

hypoxemia

finally hemodynamic collapse

Acute illness analogous to bacterial pneumonia

high fever

chills

productive cough

pleuritic chest pain

mucopurulent or purulent sputum

Flu like symptoms

fever

chills

myalgia

headache

nonproductive cough

Clinical Manifestation

Osteoarticular lesions

bone or joint pain

soft-tissue swelling

involvement of any bone may be involved

most common sites

vertebrae and pelvis

Extrapulmonary manifestations present in 25-40% of cases

Genitourinary

prostatitis and epididymitis

asymptomatic or painful urination

Central nervous system

Intracranial abscesses

Epidural abscesses

meningitis

Cutaneous lesions

verrucous or ulcerative

asymptomatic

Other organ sites reported include the eye, liver, breast, thyroid, and adrenal gland.

Initial Diagnosis

Clinically, blastomycosis can be difficult to recognize even in the endemic areas where clinicians are aware of this problem.

At the University of Mississippi Medical Center (Jackson, MS), the suspected initial diagnosis of blastomycosis was only correctly suspected in 18% of 123 patients.(7)

Most Common misdiagnosis

Pneumonia (40%)

Malignant tumors (16%)

Tuberculosis (14%)

Cutaneous involvement makes recognition easier, percentage of correct initial diagnosis to 64%.

Another associated disease commonly found in blastomycotic patients was diabetes mellitus (22%).

Underlying immunodepressive conditions & diabetes mellitus (22%)

Diagnostic Tests

In order to make a diagnosis healthcare providers will use your history and physical along with diagnostic tests.

Imaging Tests

Chest x-rays

Chest CT

Lab Tests-cultures may be done to see if Blastomyces will grow from the sample

Sputum test - culture and exam

Urinalysis - culture

Skin biopsy

Tissue biopsy

Diagnostic Tests cont.

Blastomycosis may be asymptomatic, therefore diagnostic tests may not provide the results needed to make a conclusive diagnosis.

In order to provide a definitive diagnosis it is crucial that B dermatitidis is visualized.

This should be done prior to doing a culture to confirm the diagnosis.

To have an absolute diagnosis, it is important to isolate and identify the organism on a sputum culture

Skin tests are not reliable unless sample is viewed under a microscope

Diagnosis and etiology

Definitive diagnosis is done by isolating the fungus from tissue samples.

A previous review of 153 cases of blastomycosis noted a wide variation in morphology, including size, shape, staining, and wall thickness. Variation included different fields of the same specimen

The fungus, B. dermitidis, that causes Blastomycosis only grows and makes spores under specific conditions of humidity, temperature, and nutrients

Spore-like appearance, with fluffy white mycelium

D

B

Organism cultured on blood agar

Organism stained on slide presentation

Treatment

You may not need to take medicine for a mild blastomycosis infection that stays in the lungs. Your doctor may recommend the following anti-fungal medications when the disease is severe or spreads outside of the lungs. (7)

Fluconazole

Itraconazole

Ketoconazole

Amphotericin B may be used for severe infections.

Ongoing follow-ups with your doctor may be needed to make sure the infection doesn't return.

Describe the organism and how it causes the disease

Infection occurs from exposure to conidia of B. dermatidis

conidia: a spore produced asexually by various fungi at the tip of a specialized hypha

Inhalation of aerosolized conidia from soil are deposited into pulmonary alveoli

Conversion of B. dermatitidis to yeast occurs in the lung where the host inflammatory response are triggered

Disease is spread to skin or other organs by yeasts that have not been phagocytized through the blood or lymphatic system

a low power view of hyphae growing away from the point of inoculation of a slide culture

another view of the "lollipop-like" conidiophore-conidia structures extending along the length of hyphae

more is better, another photo

BLASTOMYCES†DERMATITIDIS

PATHOGEN SAFETY DATA SHEET INFECTIOUS

SUBSTANCES

Public Health of Canada http://dictionary.reference.com/browse/conidia http://www.emedicinehealth.com/blastomycosis/page4_em.htm

Pathology

• Primary site of infection is usually in the pulmonary system. This is ‘Pulmonary blastomycosis’

Sub-Categories of blastomycosis are:

Single organ system disease such as lymphatic system, liver system, skin and other organs

May also cause generalized multi-organ disease which can lead to end stage hemodynamic collapse

Chronic dermatologic manifestations of the disease includes cutaneous manifestations that appear ‘verrucous’ and ‘ulcerative.’

Cutaneous blastomycosis: a clue to a systemic disease* Five categories of blastomycosis have been defined:

Close up of lesion along right jawline

Close up of lesion beside left nasal

Patient with a couple of verrucous and eroded plaques on the face

Blastomycosis Ulceration

Blastomycosis Ulceration

Primary Cutaneous Blastomycosis

Blastomycosis Verrucous Plaques

Virulence factors

BAD1: 120-kDa major surface protein adhesin

when BAD1 sticks on to our cells, the humoral and cell-mediated immune responses targets them and fights off the virulence factor

α-1,3 glucan: cell surface carbohydrate

mask BAD1 on surface of Blastomyces dermatitidis yeast cells so immune responses do not detect them

Both are found on surface of Blastomyces dermatitidis yeast cells

It has been found that more virulent strains of Blastomyces dermatitidis possess less BAD1 on the surface of yeast cells

http://www.scientificjournals.org/journals2007/articles/1021.htm

Epidemiology

Epidemic or sporadic

Found in United Kingdom, United States, Canada, central Europe, Africa, India, and some parts of the Middle East

Blastomycosis is more common in North America, endemic to the Midwestern, southeastern, and southcentral United States along the Ohio and Mississippi rivers.

In areas where outbreaks occur, three to six cases requires hospitalization per million persons per year

Those who frequents or work along rivers or streams are exposed to decayed vegetation in moist soil which increases their chance to contract blastomycosis.

Adults > Children

Men > Women

References

Barnes, Lauren BS, Al-Dabagh, Amir BS, BA, and Feldman,Steven R. MD, PhD Treating Rare Fungal Infections: Cutaneous Blastomycosis Volume 21 - Issue 5 - May 2013 http://www.the-dermatologist.com/content/treating-rare-fungal-infections-cutaneous-blastomycosis

Conidia. (n.d.) . In Dictionary.com online. Retrieved from http://dictionary.reference.com/browse/conidia

Davis, Charles Patrick, MD, PhD 2015, March. Blastomycosis. Retrieved on February 21, 2015 http://www.emedicinehealth.com/blastomycosis/page4_em.htm

Nguyen, Tuyet and Ortega-Loayza, Alex G. 2013, April. Blastomycosis: a clue to a systemic disease. Retrieved from https://www.researchgate.net/publication/237059549_Cutaneous_blastomycosis_A_clue_to_a_systemic_disease

Pathol, Ann Diagn. 2002 Jun;6(3):194-203. Blastomycosis: The great pretender can also be an opportunist. Initial clinical diagnosis and underlying diseases in 123 patients Retrieved on February 20, 1026 from http://www.ncbi.nlm.nih.gov/pubmed/12089732

Public Health Agency of Canada (2010) Blastomycis Dermatitidis. Retrieved from: http://www.phac-aspc.gc.ca/lab-bio/res/psds-ftss/blastomyces-dermatitidis-eng.php

Scalarone, Gene M. and Sestero, Christine M. (2007) Detection of the surface antigens BAD1 and α-(1,3)-glucan in six different strains of Blastomyces dermatitidis using monoclonal antibodies. Journal of Biology, 1(1). Retrieved from http://www.scientificjournals.org/journals2007/articles/1021.htm

Vyas, Jatin M. MD, PhD. 2014 Aug. MedlinePlus. Blastomycosis. Retrived February 20, 2016 from https://www.nlm.nih.gov/medlineplus/ency/article/000102.htm

Yuri (2012, December 2) Blastomyces Dermatitidis [Web blog]. Retrieved from http://thunderhouse4-yuri.blogspot.com/2012/12/blastomyces-dermatitidis.html