Which organism is most commonly associated with canaliculitis and sulfur granules?

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Study for the NBEO Ocular Disease Part 1 Test. Use flashcards and multiple choice questions, each with hints and explanations, to prepare for your exam! Get ready for your success!

Multiple Choice

Which organism is most commonly associated with canaliculitis and sulfur granules?

Explanation:
Sulfur granules in canaliculitis point to Actinomyces israelii. This organism is a filamentous gram-positive anaerobe that forms dense colonies; in chronic infections these colonies break into small yellowish granules, which can be pressed out or drained from the lacrimal canaliculus. That characteristic sulfur granule presence is the most distinguishing feature of Actinomyces canaliculitis, helping to separate it from infections caused by other bacteria. Staphylococcus aureus, Pseudomonas aeruginosa, and Streptococcus pyogenes can cause canalicular or ocular infections, but they do not produce sulfur granules in the draining material.

Sulfur granules in canaliculitis point to Actinomyces israelii. This organism is a filamentous gram-positive anaerobe that forms dense colonies; in chronic infections these colonies break into small yellowish granules, which can be pressed out or drained from the lacrimal canaliculus. That characteristic sulfur granule presence is the most distinguishing feature of Actinomyces canaliculitis, helping to separate it from infections caused by other bacteria. Staphylococcus aureus, Pseudomonas aeruginosa, and Streptococcus pyogenes can cause canalicular or ocular infections, but they do not produce sulfur granules in the draining material.

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