Actinomycosis pus characteristically shows which feature?

Actinomycosis pus characteristically shows which feature?

• A. Sulfur granules
• B. Spore formation
• C. Acid-fast mycelia
• D. Gram-negative diplococci

Answer: (A)

Actinomycosis pus characteristically contains sulfur granules. These are yellowish, radiating granules found in draining sinus tracts or purulent material and are clusters of Actinomyces organisms embedded in a proteinaceous matrix. The granules give the pus its characteristic appearance and are a classic diagnostic clue for Actinomyces infections, especially with cervicofacial involvement. The organisms themselves are Gram-positive, branching filamentous anaerobes and do not form spores; they are not acid-fast. So the presence of sulfur granules in pus is the hallmark feature that sets actinomycosis apart from infections caused by organisms that form spores, are acid-fast, or appear as Gram-negative diplococci.

Actinomycosis pus characteristically contains sulfur granules. These are yellowish, radiating granules found in draining sinus tracts or purulent material and are clusters of Actinomyces organisms embedded in a proteinaceous matrix. The granules give the pus its characteristic appearance and are a classic diagnostic clue for Actinomyces infections, especially with cervicofacial involvement. The organisms themselves are Gram-positive, branching filamentous anaerobes and do not form spores; they are not acid-fast. So the presence of sulfur granules in pus is the hallmark feature that sets actinomycosis apart from infections caused by organisms that form spores, are acid-fast, or appear as Gram-negative diplococci.