Microscopic sulfur granules within purulent exudate are indicative of______________?
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Answer: B. Actinomyces israelii
Explanation
Actinomyces israelii forms characteristic microscopic sulfur granules within purulent exudates. These yellowish granule aggregates represent bacterial colonies intertwined with inflammatory exudate components. Identifying sulfur granules confirms actinomycosis infection during histopathological or clinical evaluations. Actinomyces israelii is a filamentous, Gram-positive anaerobic bacterium inhabiting normal oral cavities. Mucosal trauma or dental infections allow these bacteria to invade deeper soft and hard tissues. Chronic granulomatous infections develop, producing multiple draining sinus tracts discharging pus.
Surgical drainage and prolonged high-dose penicillin therapy are required to eradicate actinomycosis. Wooden-hard swellings in the cervicofacial region should raise suspicion for actinomyces infections. Microbiologists examine purulent exudates carefully to spot diagnostic sulfur granules under microscopy. Candida albicans is a dimorphic fungus causing pseudomembranous or erythematous candidiasis infections. Nocardia brasiliensis causes nocardiosis, which features branching bacteria but lacks classic sulfur granules. Histoplasma capsulatum is a dimorphic fungus causing systemic respiratory and granulomatous oral mycoses.
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