BIOSC-116 Chapter Notes - Chapter 1: Histoplasma, Erythema Nodosum, Blastomycosis

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Fungal pneumonia: infrequent cause of pneumonia (but still prevalent) Mimic bacterial pneumonia & lung cancer, vasculitis, & drug toxicity. Pneumonia can be acute, chronic, or disseminated. Pathogens responsible for endemic fungal pneumonia and describe their geographic range. Endemic mycoses: inhalation pulmonary infection dissemination. Inhaled from environment, no human-to-human (or animal) transmission. Growth in culture very slow, but easy diagnosis to make (never a contaminant?) Histoplasma capsulatum: river valley soil fungus, bird & bat guano. Ohio and mississippi river valleys, soil disturbed by construction. Dimorphic (yeast phase in body), multiplies within macrophages. Most primary cases unrecognized (asymptomatic or mild flu-like) If symptoms > 4 weeks, treat with itraconazole (& amphotericin b if really sick) Blastomyces dermatitidis: chicago disease , great lakes region especially. Warm, moist soil of wooded areas, decaying plants, exposure to soil. Infection: inhale conidia yeast phase in lung dissemination. Acute or chronic, mimics bacterial pneumonia, tb, & cancer. Coccidiodes: dimorphic, mycelia in environment & spherules in tissue.

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