Epidemiology and Clinical Management of Blastomycosis

Blastomycosis is an invasive fungal infection caused by thermally dimorphic species of the genus Blastomyces, predominantly Blastomyces dermatitidis and the more recently identified Blastomyces gilchristii. Endemic in regions of North America and more sporadically observed in parts of Africa and India, the disease arises following inhalation of infectious conidia from environmental reservoirs such as moist soil and decaying organic matter. Clinical manifestations range from subclinical or self-limited pulmonary involvement to severe pneumonia, acute respiratory distress syndrome or disseminated disease affecting skin, bone, genitourinary tract and, infrequently, the central nervous system. Diagnosis relies on culture, histopathology and rapid antigen detection in serum or urine, although cross-reactivity with other endemic mycoses can complicate interpretation. Effective management depends on disease severity: severe or central nervous system involvement is treated initially with lipid formulations of amphotericin B, followed by step-down to oral azoles, most commonly itraconazole. For mild to moderate pulmonary or extrapulmonary disease, oral itraconazole is the first-line therapy. Delays in diagnosis and treatment contribute to morbidity and mortality, emphasising the need for heightened clinical suspicion in endemic and emerging regions. Ongoing surveillance and improved environmental mapping are critical to delineating risk zones and guiding public health interventions.

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Epidemiology and Clinical Management of Blastomycosis publication trend

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Technical terms

Thermally dimorphic fungus: A fungus that grows as mould at environmental temperatures and as yeast at body temperature.

Conidia: Asexual spores produced by the mould phase of dimorphic fungi, responsible for airborne transmission.

Hematogenous dissemination: Spread of infection via the bloodstream from the primary pulmonary site to other organs.

Lipid formulation of amphotericin B: A carrier-based preparation of amphotericin B that reduces toxicity while retaining antifungal potency.

Azoles: A class of antifungal drugs (e.g., itraconazole) that inhibit ergosterol synthesis in fungal cell membranes.

References

1. Using Insurance Claims Data to Estimate Blastomycosis Incidence, Vermont, USA, 2011–2020 - Volume 30, Number 2—February 2024 - Emerging Infectious Diseases journal - CDC. Emerging Infectious Diseases (2024).
2. Blastomycosis: A Review of Mycological and Clinical Aspects. Journal of Fungi (2023).
3. Phylogenetic Analysis Reveals a Cryptic Species Blastomyces gilchristii, sp. nov. within the Human Pathogenic Fungus Blastomyces dermatitidis. PLOS ONE (2013).
4. Blastomycosis in Minnesota, USA, 1999–2018 - Volume 26, Number 5—May 2020 - Emerging Infectious Diseases journal - CDC. Emerging Infectious Diseases (2020).